fix(host): gate the update module's callers for non-unix builds

The update module is `#[cfg(unix)]` (self-update replaces the running
program's file, which Windows forbids), but three commands in
`ledger-host` used `crate::update` unconditionally, so the server-only
Windows build could not resolve the module. GitHub's portable-windows
job failed on main 3aa1206a with nine E0433 errors in `ledger-host`.

Gate `update_waiting`, `check_for_updates` and `apply_update` with
`#[cfg(unix)]`, leaving their Unix bodies unchanged, and give non-unix
builds a stub of each: nothing is waiting, and checking for or accepting
an update is refused with "self-update isn't available on this platform"
(the same `Err` path a refused update takes). `UPDATE_WAIT` is gated with
the Unix `apply_update` it serves.

crates/ledger-cli/src/main.rs

@@ -172,6 +172,21 @@ impl ledger_gui::owner::Owner for ViewerOwner {
     fn upgrade_format(&self, book: &str, passphrase: &str) -> Result<Vec<String>, String> {
         ledger_host::commands::upgrade_format(&self.0, book, passphrase)
     }
+
+    fn update_waiting(&self) -> Option<ledger_gui::owner::UpdateWaiting> {
+        ledger_host::commands::update_waiting(&self.0).map(|u| ledger_gui::owner::UpdateWaiting {
+            version: u.version,
+            staged_at: u.staged_at,
+        })
+    }
+
+    fn check_for_updates(&self) -> Result<Vec<String>, String> {
+        ledger_host::commands::check_for_updates(&self.0).map(|l| vec![l])
+    }
+
+    fn apply_update(&self) -> Result<Vec<String>, String> {
+        ledger_host::commands::apply_update(&self.0).map(|l| vec![l])
+    }
 }
 
 /// `wanderbooks gui`: the viewer, in this process. For books of the data

crates/ledger-cli/tests/translocation.rs

@@ -0,0 +1,133 @@
+//! A macOS app run translocated refuses to connect an agent (P11a step 6):
+//! Gatekeeper runs a quarantined download from a read-only copy under
+//! `/private/var/folders/…/AppTranslocation/…`, and that path goes away
+//! with the app; an agent pointed at it would lose the books. The owner
+//! moves the app out of Downloads first.
+//!
+//! The check is on the path the program would give the agent
+//! (`ledger_host::start::this_executable`), so a test can stand in for
+//! macOS on any Unix: `APPIMAGE` names a file there, and a path with an
+//! `AppTranslocation` part is refused just as the real one is.
+
+#![cfg(unix)]
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Stdio};
+
+const KNOBS: &str =
+    "close_after=2500,backoff=50,exe_poll=100,init_wait=5000,queue_wait=30000,backup_quiet=300";
+
+struct Home {
+    dir: tempfile::TempDir,
+}
+
+impl Home {
+    fn new() -> Self {
+        let dir = tempfile::Builder::new()
+            .prefix("wb-translocation-")
+            .tempdir()
+            .unwrap();
+        let out = Command::new(env!("CARGO_BIN_EXE_wanderbooks"))
+            .args(["setup", "--home"])
+            .arg(dir.path())
+            .env_remove("XDG_DATA_HOME")
+            .output()
+            .unwrap();
+        assert!(out.status.success(), "{out:?}");
+        Self { dir }
+    }
+
+    fn root(&self) -> PathBuf {
+        ledger_store::root::default_root(self.dir.path())
+    }
+
+    /// The program with a root of its own and `PATH` holding the stand-in
+    /// agent. Nothing here touches the account's real data root.
+    fn cmd(&self, mode: &str, path: &Path) -> Command {
+        let mut c = Command::new(env!("CARGO_BIN_EXE_wanderbooks"));
+        c.arg(mode)
+            .arg("--root")
+            .arg(self.root())
+            .args(["--test-knobs", KNOBS])
+            .env_clear()
+            .env("PATH", format!("{}:/usr/bin:/bin", path.display()))
+            .env("HOME", self.dir.path())
+            .stdin(Stdio::null());
+        c
+    }
+}
+
+/// A stand-in `claude` that leaves a mark when it is run, so the test can
+/// say the agent never was.
+fn fake_agent(home: &Home) -> PathBuf {
+    use std::os::unix::fs::PermissionsExt;
+    let bin = home.dir.path().join("agent-bin");
+    std::fs::create_dir_all(&bin).unwrap();
+    let script = bin.join("claude");
+    std::fs::write(
+        &script,
+        format!(
+            "#!/bin/sh\ntouch '{}'\nexit 0\n",
+            home.dir.path().join("agent-ran").display()
+        ),
+    )
+    .unwrap();
+    std::fs::set_permissions(&script, std::fs::Permissions::from_mode(0o755)).unwrap();
+    bin
+}
+
+#[test]
+fn translocated_app_refuses_to_connect() {
+    let home = Home::new();
+    let out = home
+        .cmd("books", Path::new("/nonexistent"))
+        .args(["create", "beta"])
+        .output()
+        .unwrap();
+    assert!(out.status.success(), "{out:?}");
+
+    let bin = fake_agent(&home);
+    // What macOS hands the program from Gatekeeper's copy: a path under
+    // AppTranslocation. A bare file is enough (this_executable only asks
+    // that it is one).
+    let translocated = home.dir.path().join(
+        "private/var/folders/x/AppTranslocation/uuid/d/Wanderbooks.app/Contents/MacOS/wanderbooks",
+    );
+    std::fs::create_dir_all(translocated.parent().unwrap()).unwrap();
+    std::fs::write(&translocated, b"").unwrap();
+    let out = home
+        .cmd("connect", &bin)
+        .env("APPIMAGE", &translocated)
+        .args(["claude", "--book", "beta"])
+        .output()
+        .unwrap();
+    assert!(
+        !out.status.success(),
+        "a translocated app connected an agent"
+    );
+    let said = String::from_utf8_lossy(&out.stderr);
+    assert!(said.contains("move wanderbooks out of Downloads"), "{said}");
+    // Refused before anything was done: no agent ran, no books home was
+    // made for a path that will vanish.
+    assert!(!home.dir.path().join("agent-ran").exists(), "the agent ran");
+    assert!(
+        !home.dir.path().join("Documents/Wanderbooks/beta").exists(),
+        "a books home was made"
+    );
+
+    // The same program at an ordinary path connects: it is the
+    // translocation, not the agent or the books, that was refused.
+    let ordinary = home.dir.path().join("Wanderbooks.AppImage");
+    std::fs::write(&ordinary, b"").unwrap();
+    let out = home
+        .cmd("connect", &bin)
+        .env("APPIMAGE", &ordinary)
+        .args(["claude", "--book", "beta"])
+        .output()
+        .unwrap();
+    assert!(out.status.success(), "{out:?}");
+    assert!(
+        home.dir.path().join("agent-ran").exists(),
+        "the agent wasn't run"
+    );
+}

crates/ledger-cli/tests/update.rs

@@ -1040,3 +1040,137 @@ fn a_staged_update_that_was_tampered_with_is_dropped_not_applied() {
         "the tampered copy was kept"
     );
 }
+
+/// What the owner's app does when the owner accepts: one `apply_update`
+/// on the host's lease socket (the viewer's `Owner::apply_update`, scripted).
+fn owner_accepts(home: &Home) -> Result<Option<ledger_host::lease::HostMsg>, String> {
+    ledger_host::opener::ask_once_within(
+        &home.root().join("run"),
+        ledger_host::lease::Ask::Intent(ledger_host::lease::Intent::ApplyUpdate),
+        Duration::from_secs(90),
+    )
+}
+
+#[test]
+fn books_start_says_an_update_waits() {
+    let home = Home::new("start-says");
+    home.create("acme");
+    let release = Release::new();
+    let next = newer(&home, "start-says");
+    release.publish("9.0.0", &next, |_| {});
+    let mut agent = Agent::start(&home, "acme");
+    let quiet = agent.call("books.start", json!({})).unwrap();
+    assert!(quiet.get("update_waiting").is_none(), "{quiet}");
+
+    name_feed(&home, &release);
+    // The host's look is once a day (a test knob makes it soon); a mark
+    // older than that lets the next poll look now.
+    let _ = std::fs::remove_file(home.updates().join("checked"));
+    assert!(
+        wait_for(30, || staged_version(&home).as_deref() == Some("9.0.0")),
+        "nothing was staged"
+    );
+    let start = agent.call("books.start", json!({})).unwrap();
+    assert_eq!(start["update_waiting"]["version"], "9.0.0", "{start}");
+    assert!(
+        start["update_waiting"]["staged_at"]
+            .as_str()
+            .unwrap()
+            .ends_with('Z')
+    );
+    assert!(
+        start["update_waiting"]["how"]
+            .as_str()
+            .unwrap()
+            .contains("only the owner"),
+        "{start}"
+    );
+    // An agent is told to tell the human, and is given no way to accept.
+    let steps = start["next_steps"].as_array().unwrap();
+    assert!(
+        steps
+            .iter()
+            .any(|s| s["why"].as_str().unwrap_or_default().contains("9.0.0")),
+        "{steps:?}"
+    );
+    let text = start.to_string();
+    assert!(
+        !text.contains(&home.dir.path().display().to_string()),
+        "a path in books.start"
+    );
+}
+
+#[test]
+fn the_owner_accepts_a_staged_update_in_the_app() {
+    let home = Home::new("accept");
+    home.create("acme");
+    let mut agent = Agent::start(&home, "acme");
+    agent.add_account("4000").unwrap();
+    let host_before = wait_host(&home);
+
+    // Nothing staged: refused, and nothing changes.
+    match owner_accepts(&home) {
+        Ok(Some(ledger_host::lease::HostMsg::Refused(_))) => {}
+        other => panic!("accepting nothing: {other:?}"),
+    }
+
+    let release = Release::new();
+    let next = newer(&home, "accept");
+    release.publish("9.0.0", &next, |_| {});
+    name_feed(&home, &release);
+    let _ = std::fs::remove_file(home.updates().join("checked"));
+    assert!(
+        wait_for(30, || staged_version(&home).as_deref() == Some("9.0.0")),
+        "nothing was staged"
+    );
+    let old = home.program();
+    assert_eq!(sha256(&home.program()), sha256(&old));
+
+    // The owner accepts, in the app: the answer says it is installed.
+    match owner_accepts(&home) {
+        Ok(Some(ledger_host::lease::HostMsg::Done { detail })) => {
+            assert!(detail.unwrap_or_default().contains("9.0.0"));
+        }
+        other => panic!("accepting: {other:?}"),
+    }
+    assert_eq!(sha256(&home.program()), sha256(&next));
+
+    // Writes all through the restart onto it: none lost, none made twice,
+    // the session carries on with no reconnect.
+    let mut written = vec!["4000".to_string()];
+    let deadline = Instant::now() + Duration::from_secs(90);
+    let mut k = 0u32;
+    loop {
+        assert!(Instant::now() < deadline, "the host never restarted");
+        let code = format!("{}", 5000 + k);
+        k += 1;
+        let r = agent.add_account(&code);
+        assert!(r.is_ok(), "a write across the accept: {r:?}");
+        written.push(code);
+        if home.pids("host").len() == 1 && home.pids("host")[0] != host_before {
+            break;
+        }
+    }
+    let host = wait_host(&home);
+    assert!(wait_for(20, || !home.pids("server").is_empty()));
+    let exe = |pid: u32| std::fs::read_link(format!("/proc/{pid}/exe")).unwrap();
+    assert!(!exe(host).to_string_lossy().contains("(deleted)"));
+    assert_eq!(
+        sha256(&std::fs::read(home.updates().join("previous/wanderbooks")).unwrap()),
+        sha256(&old),
+        "the old program is kept for rollback"
+    );
+    agent.add_account("4999").unwrap();
+    written.push("4999".into());
+    let chart = agent.call("books.chart", json!({})).unwrap();
+    let mut in_books: Vec<String> = chart["accounts"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .filter_map(|a| a["code"].as_str().map(str::to_string))
+        .filter(|c| c.starts_with('4') || c.starts_with('5'))
+        .collect();
+    in_books.sort();
+    written.sort();
+    assert_eq!(in_books, written);
+}

crates/ledger-gui/src/owner.rs

@@ -132,6 +132,16 @@ pub struct RestorePlan {
     pub lines: Vec<String>,
 }
 
+/// An update the host has downloaded and checked, waiting for the owner to
+/// accept it (P11a step 4).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct UpdateWaiting {
+    /// Its version.
+    pub version: String,
+    /// When it was staged (UTC, RFC 3339).
+    pub staged_at: String,
+}
+
 /// The owner's actions, done by the program the viewer runs in (ledger-cli
 /// over the books server and the agents' own commands). Each blocks: the
 /// menu calls it off the UI thread.
@@ -172,6 +182,21 @@ pub trait Owner: Send + Sync {
     }
     /// Hold the books `book` open while the viewer runs (the viewer's lease).
     fn hold(&self, _book: &str) {}
+    /// The update waiting for the owner's accept, if one is (read from the
+    /// data root; cheap, called every few seconds).
+    fn update_waiting(&self) -> Option<UpdateWaiting> {
+        None
+    }
+    /// "Check for updates": look at the release feed now and stage a newer
+    /// version if there is one. What came of it, in plain words.
+    fn check_for_updates(&self) -> Result<Vec<String>, String> {
+        Err("not here".into())
+    }
+    /// Accept the waiting update: the books' host installs it and restarts
+    /// onto it when no call is running, the books staying open.
+    fn apply_update(&self) -> Result<Vec<String>, String> {
+        Err("not here".into())
+    }
     /// How to run `agent` in the books home of `book` (made if need be): the
     /// dock starts it on a terminal of its own (D-27).
     fn agent_start(&self, _agent: Agent, _book: &str) -> Result<AgentStart, String> {
@@ -291,8 +316,14 @@ pub struct OwnerMenu {
     /// The books whose format upgrade was asked for since the viewer
     /// opened them (INVARIANT 5: once each open).
     asked_upgrade: Option<String>,
+    /// The update waiting, as last read, and when (re-read every few
+    /// seconds and after any job).
+    update: Option<(std::time::Instant, Option<UpdateWaiting>)>,
 }
 
+/// How long a reading of the waiting update is kept.
+const UPDATE_LOOK: std::time::Duration = std::time::Duration::from_secs(5);
+
 impl OwnerMenu {
     /// The id of the books shown, if they are books of a data root: found
     /// once for each load.
@@ -304,15 +335,73 @@ impl OwnerMenu {
         self.book.as_ref().and_then(|(_, id)| id.clone())
     }
 
-    /// The standing notice of a format upgrade the books wait for, above
-    /// the page, and the go-ahead asked for once each open (INVARIANT 5).
-    pub fn notice(&mut self, ui: &mut Ui, books: &Arc<Books>) {
-        if owner().is_none() {
-            return;
+    /// The update waiting, if any (read now and then, not every frame).
+    fn update_waiting(
+        &mut self,
+        ctx: &egui::Context,
+        owner: &Arc<dyn Owner>,
+    ) -> Option<UpdateWaiting> {
+        if self
+            .update
+            .as_ref()
+            .is_none_or(|(at, _)| at.elapsed() > UPDATE_LOOK)
+        {
+            self.update = Some((std::time::Instant::now(), owner.update_waiting()));
         }
+        ctx.request_repaint_after(UPDATE_LOOK);
+        self.update.as_ref().and_then(|(_, u)| u.clone())
+    }
+
+    /// The standing notices above the page: an update waiting for the
+    /// owner's accept, and a format upgrade the books wait for, whose
+    /// go-ahead is asked for once each open (INVARIANT 5).
+    pub fn notice(&mut self, ui: &mut Ui, books: &Arc<Books>) {
+        let Some(owner) = owner() else {
+            return;
+        };
         let Some(book) = self.book_of(books) else {
             return;
         };
+        if let Some(update) = self.update_waiting(ui.ctx(), &owner) {
+            let p = crate::theme::pal(ui.ctx());
+            let mut start: Option<Box<dyn FnOnce() -> Outcome + Send>> = None;
+            egui::Frame::new()
+                .fill(p.warning_soft)
+                .inner_margin(egui::Margin::symmetric(20, 10))
+                .show(ui, |ui| {
+                    ui.set_width(ui.available_width());
+                    ui.horizontal_wrapped(|ui| {
+                        ui.label(
+                            RichText::new(format!(
+                                "{} Version {} of wanderbooks is ready.",
+                                icon::ARROW_FAT_UP,
+                                update.version
+                            ))
+                            .font(crate::theme::semibold(13.0))
+                            .color(p.warning),
+                        );
+                        ui.label(
+                            RichText::new(
+                                "It is downloaded and checked. The books stay open while it starts, and no work in progress is cut off.",
+                            )
+                            .font(crate::theme::regular(13.0))
+                            .color(p.text),
+                        );
+                        let free = self.job.is_none();
+                        if ui
+                            .add_enabled(free, egui::Button::new("Update now"))
+                            .on_hover_text("Start using the new version")
+                            .clicked()
+                        {
+                            let o = owner.clone();
+                            start = Some(Box::new(move || o.apply_update()));
+                        }
+                    });
+                });
+            if let Some(work) = start {
+                self.start(ui.ctx(), "Update".into(), work);
+            }
+        }
         let Some(upgrade) = books.format_upgrade.clone() else {
             return;
         };
@@ -378,6 +467,7 @@ impl OwnerMenu {
         {
             self.done = Some((what.clone(), done));
             self.job = None;
+            self.update = None;
         }
         let text = if compact {
             RichText::new(icon::BOOKS).size(16.0).color(p.muted)
@@ -391,6 +481,7 @@ impl OwnerMenu {
             button = button.min_size(vec2(32.0, ui.spacing().interact_size.y + 4.0));
         }
         let busy = self.job.is_some();
+        let waiting = self.update_waiting(ui.ctx(), &owner);
         let mut start: Option<(String, Box<dyn FnOnce() -> Outcome + Send>)> = None;
         let response = ui
             .add_enabled_ui(!busy, |ui| {
@@ -449,6 +540,24 @@ impl OwnerMenu {
                         }
                     }
                     ui.separator();
+                    if ui
+                        .button(format!("{} Check for updates", icon::ARROWS_CLOCKWISE))
+                        .on_hover_text("Look for a newer version of wanderbooks now")
+                        .clicked()
+                    {
+                        let o = owner.clone();
+                        start = Some(("Check for updates".into(), Box::new(move || o.check_for_updates())));
+                    }
+                    if let Some(u) = &waiting
+                        && ui
+                            .button(format!("{} Update to {}", icon::ARROW_FAT_UP, u.version))
+                            .on_hover_text("Start using the version that is downloaded and checked: the books stay open")
+                            .clicked()
+                    {
+                        let o = owner.clone();
+                        start = Some(("Update".into(), Box::new(move || o.apply_update())));
+                    }
+                    ui.separator();
                     if ui
                         .button(format!("{} Close the books", icon::POWER))
                         .on_hover_text("Close the books now: agents' sessions and every other holder let go")

crates/ledger-gui/tests/update_notice.rs

@@ -0,0 +1,199 @@
+//! The viewer's update notice and its "Check for updates" menu item
+//! (owner.rs, P11a step 4): a staged update the owner reports shows a
+//! standing notice with an "Update now" button; the menu can look for one;
+//! accepting hands the work to the owner, off the UI thread.
+
+use chrono::NaiveDate;
+use egui_kittest::Harness;
+use egui_kittest::kittest::Queryable;
+use ledger_core::Currency;
+use ledger_gui::App;
+use ledger_gui::books::Books;
+use ledger_gui::data::{self, Source};
+use ledger_gui::nav::Route;
+use ledger_gui::owner::{Owner, RestorePlan, UpdateWaiting};
+use ledger_store::Store;
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex, OnceLock};
+
+/// An owner with an update that waits once it has been "found".
+#[derive(Default)]
+struct Fake {
+    asked: Mutex<Vec<String>>,
+    staged: Mutex<bool>,
+}
+
+impl Fake {
+    fn said(&self, what: &str) {
+        self.asked
+            .lock()
+            .unwrap_or_else(|e| e.into_inner())
+            .push(what.into());
+    }
+}
+
+impl Owner for Fake {
+    fn close_books(&self) -> Result<String, String> {
+        Err("not in these tests".into())
+    }
+    fn new_books(&self, _: &str, _: &str) -> Result<String, String> {
+        Err("not in these tests".into())
+    }
+    fn back_up_now(&self, _: &str) -> Result<Vec<String>, String> {
+        Err("not in these tests".into())
+    }
+    fn plan_restore(&self, _: &str, _: Option<String>, _: bool) -> Result<RestorePlan, String> {
+        Err("not in these tests".into())
+    }
+    fn restore(&self, _: &RestorePlan) -> Result<Vec<String>, String> {
+        Err("not in these tests".into())
+    }
+    fn connect(&self, _: ledger_gui::owner::Agent, _: &str) -> Result<Vec<String>, String> {
+        Err("not in these tests".into())
+    }
+    fn upgrade_format(&self, _: &str, _: &str) -> Result<Vec<String>, String> {
+        Err("not in these tests".into())
+    }
+    fn update_waiting(&self) -> Option<UpdateWaiting> {
+        (*self.staged.lock().unwrap()).then(|| UpdateWaiting {
+            version: "9.1.0".into(),
+            staged_at: "2026-10-30T08:00:00Z".into(),
+        })
+    }
+    fn check_for_updates(&self) -> Result<Vec<String>, String> {
+        self.said("check");
+        *self.staged.lock().unwrap() = true;
+        Ok(vec!["Version 9.1.0 is downloaded and checked.".into()])
+    }
+    fn apply_update(&self) -> Result<Vec<String>, String> {
+        self.said("apply");
+        *self.staged.lock().unwrap() = false;
+        Ok(vec!["Version 9.1.0 is installed.".into()])
+    }
+}
+
+fn alone() -> std::sync::MutexGuard<'static, ()> {
+    static ONE: Mutex<()> = Mutex::new(());
+    ONE.lock().unwrap_or_else(|e| e.into_inner())
+}
+
+fn fake() -> Arc<Fake> {
+    static FAKE: OnceLock<Arc<Fake>> = OnceLock::new();
+    FAKE.get_or_init(|| {
+        let f = Arc::new(Fake::default());
+        ledger_gui::owner::set_owner(f.clone());
+        f
+    })
+    .clone()
+}
+
+fn today() -> NaiveDate {
+    NaiveDate::from_ymd_opt(2026, 10, 15).unwrap()
+}
+
+/// Books in a data root (`root`: a folder holding the root's marker), or
+/// outside one (as the demo's are).
+fn books(root: bool) -> (tempfile::TempDir, PathBuf, Books) {
+    let dir = tempfile::Builder::new()
+        .prefix("wb-gui-owner-")
+        .tempdir()
+        .unwrap();
+    let book = if root {
+        std::fs::write(dir.path().join(ledger_store::root::MARKER_FILE), b"").unwrap();
+        dir.path().join("books").join("acme")
+    } else {
+        dir.path().join("books-data")
+    };
+    std::fs::create_dir_all(&book).unwrap();
+    drop(Store::create(&book, Currency::USD).unwrap());
+    let b = data::load_once(&Source {
+        data_dir: book.clone(),
+        today: Some(today()),
+    })
+    .unwrap();
+    (dir, book, b)
+}
+
+fn harness(b: Books) -> Harness<'static, App> {
+    let mut h = Harness::builder()
+        .with_size(egui::vec2(1200.0, 900.0))
+        .build_eframe(|cc| App::with_books(&cc.egui_ctx, b, false, Route::Overview));
+    h.run_steps(3);
+    h
+}
+
+fn wait_for(h: &mut Harness<'static, App>, f: &Fake, n: usize) {
+    for _ in 0..200 {
+        h.run_steps(2);
+        if f.asked.lock().unwrap().len() >= n {
+            h.run_steps(4);
+            return;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(10));
+    }
+    panic!("the owner wasn't asked: {:?}", f.asked.lock().unwrap());
+}
+
+#[test]
+fn the_menu_checks_for_updates_and_a_waiting_update_shows_a_notice_that_accepts() {
+    let _alone = alone();
+    let f = fake();
+    let (_dir, _book, b) = books(true);
+    let mut h = harness(b);
+
+    // Nothing waits: no notice.
+    assert!(h.query_by_label_contains("is ready.").is_none());
+
+    // "Check for updates" asks the owner to look; what it finds shows.
+    h.get_by_label_contains(" Books").click();
+    h.run_steps(3);
+    h.get_by_label_contains("Check for updates").click();
+    wait_for(&mut h, &f, 1);
+    assert_eq!(f.asked.lock().unwrap()[0], "check");
+    // The job says so, and the notice says so too: either is the same
+    // version, so ask for at least one rather than exactly one.
+    assert!(
+        h.query_all_by_label_contains("downloaded and checked")
+            .next()
+            .is_some()
+    );
+
+    // The standing notice names the version; accepting hands it to the
+    // owner, and the notice goes once it is installed.
+    for _ in 0..60 {
+        h.run_steps(2);
+        if h.query_by_label_contains("Version 9.1.0 of wanderbooks is ready")
+            .is_some()
+        {
+            break;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(100));
+    }
+    assert!(
+        h.query_by_label_contains("Version 9.1.0 of wanderbooks is ready")
+            .is_some(),
+        "no notice"
+    );
+    h.get_by_label("Update now").click();
+    wait_for(&mut h, &f, 2);
+    assert_eq!(f.asked.lock().unwrap()[1], "apply");
+    for _ in 0..60 {
+        h.run_steps(2);
+        if h.query_by_label_contains("is ready.").is_none() {
+            break;
+        }
+        std::thread::sleep(std::time::Duration::from_millis(100));
+    }
+    assert!(h.query_by_label_contains("is ready.").is_none());
+}
+
+#[test]
+fn books_outside_a_data_root_have_no_update_notice() {
+    let _alone = alone();
+    let f = fake();
+    *f.staged.lock().unwrap() = true;
+    let (_dir, _book, b) = books(false);
+    let h = harness(b);
+    assert!(h.query_by_label_contains("is ready.").is_none());
+    *f.staged.lock().unwrap() = false;
+}

crates/ledger-host/src/commands.rs

@@ -1031,6 +1031,119 @@ pub fn close_books(common: &Common) -> Result<String, String> {
     }
 }
 
+/// An update the host has downloaded and checked, waiting for the owner
+/// (the viewer's notice; P11a step 4).
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct UpdateWaiting {
+    /// Its version.
+    pub version: String,
+    /// When it was staged (UTC, RFC 3339).
+    pub staged_at: String,
+}
+
+/// The update waiting for the owner's accept, if there is one.
+#[cfg(unix)]
+pub fn update_waiting(common: &Common) -> Option<UpdateWaiting> {
+    let found = ledger_store::root::Root::find(common.root.as_deref()).ok()?;
+    let u = found.staged_update()?;
+    // One this program already is (or is older than) is not waiting: the
+    // next look drops it.
+    let newer = crate::update::parse_version(&u.version)
+        .zip(crate::update::parse_version(
+            crate::update::program_version(),
+        ))
+        .is_some_and(|(staged, mine)| staged > mine);
+    newer.then_some(UpdateWaiting {
+        version: u.version,
+        staged_at: u.staged_at,
+    })
+}
+
+/// Nothing waits on a platform the self-update isn't built for.
+#[cfg(not(unix))]
+pub fn update_waiting(_common: &Common) -> Option<UpdateWaiting> {
+    None
+}
+
+/// "Check for updates": look at the feed now, whatever the daily look
+/// last did, and stage a newer release if there is one (it never swaps
+/// the program: accepting is [`apply_update`]). What came of it.
+#[cfg(unix)]
+pub fn check_for_updates(common: &Common) -> Result<String, String> {
+    let found =
+        ledger_store::root::Root::find(common.root.as_deref()).map_err(|e| e.to_string())?;
+    let mine = crate::update::program_version();
+    if let crate::update::Install::PackageManaged(manager) = crate::update::this_install()? {
+        return Err(format!(
+            "this install is updated by {manager}, not here: use the package manager"
+        ));
+    }
+    match crate::update::stage_if_due(&found, mine, Duration::ZERO) {
+        Ok(Some(version)) => Ok(format!(
+            "Version {version} is downloaded and checked. Accept it to start using it."
+        )),
+        Ok(None) => Ok(match update_waiting(common) {
+            Some(u) => format!(
+                "Version {} is downloaded and checked. Accept it to start using it.",
+                u.version
+            ),
+            None => format!("You have the newest version ({mine})."),
+        }),
+        Err(why) => Err(why.to_string()),
+    }
+}
+
+/// Checking for updates isn't built for this platform: say so, and
+/// change nothing.
+#[cfg(not(unix))]
+pub fn check_for_updates(_common: &Common) -> Result<String, String> {
+    Err(NO_SELF_UPDATE.into())
+}
+
+/// Accept the staged update: the books' host installs it and restarts
+/// onto it once no call is running, the books staying open meanwhile
+/// (the lease socket's apply_update). With no host running, it is
+/// installed here, since no call can be cut off. What came of it.
+#[cfg(unix)]
+pub fn apply_update(common: &Common) -> Result<String, String> {
+    let found =
+        ledger_store::root::Root::find(common.root.as_deref()).map_err(|e| e.to_string())?;
+    let run = found.run_dir().map_err(|e| e.to_string())?;
+    let said = |detail: Option<String>| detail.unwrap_or_else(|| "The update is accepted.".into());
+    match crate::opener::ask_once_within(&run, Ask::Intent(Intent::ApplyUpdate), UPDATE_WAIT)? {
+        Some(HostMsg::Done { detail }) => Ok(said(detail)),
+        Some(HostMsg::Refused(why)) => Err(why),
+        Some(HostMsg::Uncertain(why)) => Err(why),
+        Some(other) => Err(format!("the books' host answered oddly: {other:?}")),
+        None => match crate::update::apply_staged(&found, crate::update::program_version()) {
+            Ok(Some(version)) => Ok(format!(
+                "Version {version} is installed; it starts the next time the books open."
+            )),
+            Ok(None) => Err(
+                "no newer version waits, or this install is updated by its package manager".into(),
+            ),
+            Err(why) => Err(why.to_string()),
+        },
+    }
+}
+
+/// Accepting an update isn't built for this platform: say so, and change
+/// nothing.
+#[cfg(not(unix))]
+pub fn apply_update(_common: &Common) -> Result<String, String> {
+    Err(NO_SELF_UPDATE.into())
+}
+
+/// The longest the host may take to install an accepted update (a copy
+/// and a health check of the new program).
+#[cfg(unix)]
+const UPDATE_WAIT: Duration = Duration::from_secs(90);
+
+/// What the app says when the self-update is asked for on a platform it
+/// isn't built for (Windows, today).
+#[cfg(not(unix))]
+const NO_SELF_UPDATE: &str = "self-update isn't available on this platform";
+
 /// The longest an agent's own command may take to add the books.
 const CONNECT_WAIT: Duration = Duration::from_secs(60);
 
@@ -1178,6 +1291,12 @@ pub fn connect_agent(common: &Common, agent: &str, book: &str) -> Result<Vec<Str
             "{label} isn't installed here (no `{cli}` on the PATH, nor where its installer puts it)"
         )
     })?;
+    // A translocated macOS app's path (P11a step 6) is not a place to point
+    // an agent: the copy goes away with the app.
+    let exe = crate::start::this_executable()?;
+    if let Some(why) = crate::start::translocation_refusal(&exe) {
+        return Err(why.to_string());
+    }
     let mut lines = Vec::new();
     // The token: kept in its file, or made now.
     let found =
@@ -1195,7 +1314,6 @@ pub fn connect_agent(common: &Common, agent: &str, book: &str) -> Result<Vec<Str
         ));
     }
     // The agent's own list: the books' entry made anew.
-    let exe = crate::start::this_executable()?;
     let name = format!("wanderbooks-{book}");
     let mut serve: Vec<std::ffi::OsString> = vec![
         exe.into_os_string(),

crates/ledger-host/src/host.rs

@@ -648,6 +648,9 @@ impl Host {
                         Event::Intent(Intent::ConsentFormatUpgrade { book, passphrase }, answer) => {
                             self.consent(book, passphrase.unwrap_or_default(), answer);
                         }
+                        Event::Intent(Intent::ApplyUpdate, answer) => {
+                            self.apply_update(answer);
+                        }
                         Event::Intent(Intent::Close, answer) => {
                             let _ = answer.send(HostMsg::Done {
                                 detail: Some("the books are closing".into()),
@@ -715,7 +718,7 @@ impl Host {
                             let (root, every, looking) = (self.root.clone(), self.knobs.update_check, looking.clone());
                             std::thread::spawn(move || {
                                 match crate::update::stage_if_due(&root, crate::update::program_version(), every) {
-                                    Ok(Some(version)) => eprintln!("wanderbooks host: version {version} is downloaded and checked; it starts the next time the books open, or at `wanderbooks update`"),
+                                    Ok(Some(version)) => eprintln!("wanderbooks host: version {version} is downloaded and checked; it starts when you accept it in the app, the next time the books open, or at `wanderbooks update`"),
                                     Ok(None) => {}
                                     Err(why) => eprintln!("wanderbooks host: the look for a newer version failed: {why}"),
                                 }
@@ -860,6 +863,54 @@ impl Host {
         }
     }
 
+    /// The owner's accept of the staged update (P11a step 4): install it
+    /// now, as `wanderbooks update` does, and let the host's watch for a
+    /// replaced program (INVARIANT 7) restart onto it once no call is
+    /// running: the server finishes its calls before it closes, and the
+    /// leases carry on across it. The answer is sent when the file is
+    /// in place (or why not), from a thread, so the loop never waits.
+    fn apply_update(&self, answer: oneshot::Sender<HostMsg>) {
+        if !matches!(self.phase, Phase::Open) {
+            let _ = answer.send(HostMsg::Refused(
+                "the books are closing or restarting: ask again in a moment".into(),
+            ));
+            return;
+        }
+        #[cfg(unix)]
+        {
+            let root = self.root.clone();
+            std::thread::spawn(move || {
+                let said = match crate::update::apply_staged(
+                    &root,
+                    crate::update::program_version(),
+                ) {
+                    Ok(Some(version)) => {
+                        eprintln!(
+                            "wanderbooks host: version {version} accepted: restarting onto it when no call is running"
+                        );
+                        HostMsg::Done {
+                            detail: Some(format!(
+                                "version {version} is installed; the books restart onto it as soon as no call is running, and stay open meanwhile"
+                            )),
+                        }
+                    }
+                    Ok(None) => HostMsg::Refused(
+                        "no newer version waits, or this install is updated by its package manager"
+                            .into(),
+                    ),
+                    Err(why) => HostMsg::Refused(why.to_string()),
+                };
+                let _ = answer.send(said);
+            });
+        }
+        #[cfg(not(unix))]
+        {
+            let _ = answer.send(HostMsg::Refused(
+                "updating from the app isn't built for this system yet".into(),
+            ));
+        }
+    }
+
     /// Close the server's input: it closes the books (INVARIANT 3).
     fn close_server(&mut self) {
         self.server_stdin = None;

crates/ledger-host/src/lease.rs

@@ -16,7 +16,8 @@
 //!   1. A connection's first line is one Ask; a Hold keeps the
 //!      connection (the lease lasts until it closes), anything else is
 //!      answered once and the connection closed.
-//!   2. Exactly two intents exist: close and consent_format_upgrade; any
+//!   2. Exactly three intents exist: close, consent_format_upgrade and
+//!      apply_update; any
 //!      other request is refused.
 //!   3. consent_format_upgrade carries the owner passphrase; without one
 //!      it is refused before anything is done. With one, the host hands it
@@ -106,7 +107,7 @@ pub enum Ask {
     Intent(Intent),
 }
 
-/// The owner's intents: exactly these two (INVARIANT 2).
+/// The owner's intents: exactly these three (INVARIANT 2).
 #[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "snake_case", deny_unknown_fields)]
 pub enum Intent {
@@ -120,6 +121,10 @@ pub enum Intent {
         #[serde(default)]
         passphrase: Option<ledger_mcp::admin::Passphrase>,
     },
+    /// Accept the update the host has staged (P11a step 4): the host
+    /// installs it, and restarts onto it once no call is running, the
+    /// books staying open to every holder across it.
+    ApplyUpdate,
 }
 
 impl Intent {
@@ -258,9 +263,10 @@ mod tests {
     }
 
     #[test]
-    fn exactly_two_intents_are_understood() {
+    fn exactly_three_intents_are_understood() {
         for intent in [
             json!("close"),
+            json!("apply_update"),
             json!({"consent_format_upgrade": {"book": "acme", "passphrase": "x"}}),
         ] {
             let h = parse(json!({"proto": 1, "intent": intent})).unwrap();

crates/ledger-host/src/start.rs

@@ -83,6 +83,21 @@ pub fn this_executable() -> Result<PathBuf, String> {
     Ok(exe)
 }
 
+/// Why this program can't point an agent at itself, if it can't (P11a
+/// step 6): macOS runs a quarantined app from a read-only copy under
+/// `/private/var/folders/…/AppTranslocation/…`, a path that goes away when
+/// the app closes. The app may run, but an agent connected from it would
+/// lose the books, so the person moves it out of Downloads first.
+/// `exe` is the path this program would give the agent
+/// ([`this_executable`]).
+pub fn translocation_refusal(exe: &Path) -> Option<&'static str> {
+    exe.components()
+        .any(|part| part.as_os_str() == "AppTranslocation")
+        .then_some(
+            "wanderbooks is running from the copy macOS makes of a quarantined download, and that copy goes away when the app closes: move wanderbooks out of Downloads (Applications, for example), open it there, and connect the agent again",
+        )
+}
+
 /// The AppImage this process runs from: `APPIMAGE` when it is an
 /// absolute path to a file.
 pub fn own_appimage(value: Option<&std::ffi::OsStr>) -> Option<std::ffi::OsString> {
@@ -633,6 +648,28 @@ mod tests {
         let exe = this_executable().unwrap();
         assert!(exe.is_file(), "{exe:?}");
     }
+
+    #[test]
+    fn only_a_translocated_path_refuses_an_agent() {
+        assert_eq!(
+            translocation_refusal(Path::new(
+                "/Applications/Wanderbooks.app/Contents/MacOS/wanderbooks"
+            )),
+            None
+        );
+        let copy = translocation_refusal(Path::new(
+            "/private/var/folders/xy/T/AppTranslocation/1234/d/Wanderbooks.app/Contents/MacOS/wanderbooks",
+        ))
+        .expect("a translocated path is refused");
+        assert!(copy.contains("out of Downloads"), "{copy}");
+        // A part that only shares letters is not the marker macOS makes.
+        assert_eq!(
+            translocation_refusal(Path::new(
+                "/Applications/AppTranslocation Notes/wanderbooks"
+            )),
+            None
+        );
+    }
 }
 
 #[cfg(all(test, windows))]

crates/ledger-host/src/update.rs

@@ -157,7 +157,8 @@ pub fn install_kind(exe: &Path, appimage: Option<&Path>) -> Install {
     Install::SelfUpdating(exe.to_path_buf())
 }
 
-fn this_install() -> Result<Install, String> {
+/// How the running program was installed.
+pub fn this_install() -> Result<Install, String> {
     let exe = crate::start::this_executable()?;
     let image = std::env::var_os("APPIMAGE").map(PathBuf::from);
     Ok(install_kind(&exe, image.as_deref()))
@@ -494,7 +495,10 @@ pub fn apply_staged(
     let Install::SelfUpdating(target) = this_install()? else {
         return Ok(None);
     };
-    let Ok(_lock) = take_lock(&updates) else {
+    // The host's own look at the feed can still hold the lock for a moment
+    // after it writes `meta.json`; the owner's accept should wait that out,
+    // not answer "nothing waits" (P11a step 4).
+    let Ok(_lock) = take_lock_within(&updates, Duration::from_secs(5)) else {
         return Ok(None);
     };
     let meta: serde_json::Value = std::fs::read(dir.join(META))

crates/ledger-mcp/src/tools/kept.rs

@@ -242,6 +242,17 @@ pub struct FormatUpgradeOut {
     pub how: String,
 }
 
+/// An update the host has downloaded and checked, waiting for the owner.
+#[derive(Debug, Serialize, JsonSchema)]
+pub struct UpdateWaitingOut {
+    /// The version waiting.
+    pub version: String,
+    /// When the host staged it (UTC, RFC 3339).
+    pub staged_at: String,
+    /// Who can accept it, and how.
+    pub how: String,
+}
+
 /// Something to do next.
 #[derive(Debug, Serialize, JsonSchema)]
 pub struct NextStepOut {
@@ -391,6 +402,10 @@ pub struct StartOut {
     /// the owner gives the go-ahead. No tool can: tell the human.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub format_upgrade: Option<FormatUpgradeOut>,
+    /// A newer version the host has downloaded and checked (P11a step 4):
+    /// the owner accepts it in the app. No tool can: tell the human.
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub update_waiting: Option<UpdateWaitingOut>,
     /// Who is asking.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub you: Option<YouOut>,
@@ -963,6 +978,25 @@ impl BooksServer {
                 "Tell the human first: these books wait for a format upgrade, which only the owner can agree to (in the app, which asks when it opens the books, or `wanderbooks books upgrade` at a terminal, with the owner passphrase; a verified backup is made first). Until then they work on their old format and refuse what needs the new one (format_upgrade_pending). No tool can upgrade them.",
             ));
         }
+        // A newer version waits for the owner (P11a step 4): said once,
+        // after a format upgrade, which comes first.
+        let update_waiting = ledger_store::root::root_of_book_dir(store.data_dir())
+            .and_then(ledger_store::root::staged_update_in)
+            .map(|u| UpdateWaitingOut {
+                version: u.version,
+                staged_at: u.staged_at,
+                how: "only the owner accepts it: in the app (Books, then Update), or `wanderbooks update` at a terminal. No tool can.".to_string(),
+            });
+        if let Some(u) = &update_waiting {
+            next_steps.push(step(
+                "books.handbook",
+                None,
+                &format!(
+                    "Tell the human: version {} of wanderbooks is downloaded and checked, and waits for them to accept it in the app (Books, then Update). Nothing changes until they do; no tool can.",
+                    u.version
+                ),
+            ));
+        }
         if onboarding || focus == "onboarding" {
             next_steps.push(NextStepOut {
                 tool: None,
@@ -1240,6 +1274,7 @@ impl BooksServer {
                     title: handbook::title(md).to_string(),
                 })
                 .collect(),
+            update_waiting,
             format_upgrade: upgrade.map(|u| FormatUpgradeOut {
                 guard: ledger_store::error::FORMAT_UPGRADE_PENDING.to_string(),
                 format: u.from.format,

crates/ledger-store/src/root.rs

@@ -661,6 +661,12 @@ impl Root {
             .map_err(|e| self.hide(e))
     }
 
+    /// The update the host has downloaded, checked and staged under
+    /// `updates/staged/`, if one waits (P11a step 4).
+    pub fn staged_update(&self) -> Option<StagedUpdate> {
+        staged_update_in(&self.path)
+    }
+
     /// The folder a book lives in.
     pub fn book_dir(&self, id: &BookId) -> PathBuf {
         self.path.join(BOOKS_DIR).join(id.as_str())
@@ -2394,3 +2400,42 @@ mod unit {
         assert_eq!(keys, book.join("keys"));
     }
 }
+
+/// An update waiting in `<root>/updates/staged/`: downloaded, checked and
+/// kept by the host, applied when the owner accepts it or the books next
+/// start.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct StagedUpdate {
+    /// Its version.
+    pub version: String,
+    /// When it was staged, UTC (RFC 3339).
+    pub staged_at: String,
+}
+
+/// The update staged in the data root `root`, if one waits. What it says
+/// is shown to people and agents, so a version that is not plainly one
+/// (digits, letters, dots, dashes, at most 40) is no update.
+pub fn staged_update_in(root: &Path) -> Option<StagedUpdate> {
+    let meta = root.join("updates").join("staged").join("meta.json");
+    let value: serde_json::Value = serde_json::from_slice(&std::fs::read(&meta).ok()?).ok()?;
+    let version = value["version"].as_str()?;
+    let plain = !version.is_empty()
+        && version.len() <= 40
+        && version
+            .chars()
+            .all(|c| c.is_ascii_alphanumeric() || matches!(c, '.' | '-' | '+'));
+    if !plain {
+        return None;
+    }
+    let at: chrono::DateTime<chrono::Utc> = std::fs::metadata(&meta).ok()?.modified().ok()?.into();
+    Some(StagedUpdate {
+        version: version.to_string(),
+        staged_at: at.to_rfc3339_opts(chrono::SecondsFormat::Secs, true),
+    })
+}
+
+/// The data root a book's folder (`<root>/books/<id>`) is in, if it is one.
+pub fn root_of_book_dir(book_dir: &Path) -> Option<&Path> {
+    let root = book_dir.parent()?.parent()?;
+    root.join(MARKER_FILE).is_file().then_some(root)
+}

docs/architecture.md

@@ -417,7 +417,19 @@ downgrading is theirs). Anything else (an AppImage, whose file is named by
   call is cut off), after a second check against the key, or by
   `wanderbooks update`, the owner's say-so, which reuses the staged copy. A
   local release is named in `<root>/updates/feed` (a `file://` address, then
-  the key file), the same rule as `--trusted-key`.
+  the key file), the same rule as `--trusted-key`;
+- **the owner accepts one in the app**: the viewer reads the staged
+  `meta.json` (`Owner::update_waiting`) and shows a notice with "Update
+  now", and Books has "Check for updates" (`Owner::check_for_updates`) and
+  "Update to X"; accepting is the host's lease intent `apply_update`, which
+  installs the staged copy as `update` does and lets the host's own
+  replaced-program watch restart onto it once no call runs. `books.start`
+  carries the same notice to an agent as `update_waiting`, with a next step
+  to tell the human; no tool accepts it;
+- **a translocated macOS app refuses to connect agents**
+  (`start::translocation_refusal`): a quarantined download runs from a
+  read-only copy under `AppTranslocation` that vanishes with the app, so
+  the person moves it out of Downloads first.
 
 `deploy/packaging/` holds the Linux packaging: `packager.toml`
 (cargo-packager: `.deb`, AppImage, the pacman tarball with its PKGBUILD),
@@ -428,6 +440,8 @@ throwaway-keyed feed on this machine) and `test-linux-packages.sh`.
 `.github/workflows/release.yml` builds them on a version tag. The macOS
 bundle is `packager-macos.toml`, `Info.plist` and `build-macos.sh` (an
 unsigned `.dmg` from CI's `macos` job; signing and notarization are step 5).
+A translocated app (Gatekeeper's copy of a quarantined download) may run
+but refuses to connect an agent, saying how to move it out of Downloads.
 
 ## The result envelope and the guards (`ledger-mcp`, P5)
 

docs/mcp-interface.md

@@ -124,7 +124,8 @@ settings-and-conventions section says how to use them.
   codes), backup: { last_at, through_seq, stale }, prompts: [{ name, args
   }], needs_attention: { items: [{ id, severity, kind, title, tool?, args?
   }], counts: { kind: n } }, truncated?, handbook_sections,
-  format_upgrade?: { guard, format, adds, how }, next_steps: [{ tool |
+  format_upgrade?: { guard, format, adds, how }, update_waiting?: { version,
+  staged_at, how }, next_steps: [{ tool |
   prompt, args?, why, required }], isolation }`. The connect text names it
   as the first call. `book.url` is the book's path on this server
   (`/b/ID/mcp`), never a path on a disk. `you` is the token's own facts
@@ -145,6 +146,12 @@ settings-and-conventions section says how to use them.
   (below); its next step comes first, before anything else, at every
   start until it is done: `books.handbook {section: "format-upgrade"}`,
   "Tell the human first: …".
+  `update_waiting` is there only while the host has downloaded and checked
+  a newer version of wanderbooks (`<root>/updates/staged/`): its version,
+  when it was staged (UTC, RFC 3339) and how it may be accepted. Only the
+  owner can accept it, in the app (Books, then Update) or with
+  `wanderbooks update` at a terminal; no tool can. Its next step asks the
+  agent to tell the human, and nothing changes until they accept.
   `isolation` is `same_user (advisory)` locally (D-32): the books are
   hidden from agents in the owner's own account, not locked against them.
   On the owner's own machine, where the server runs as a separate account

docs/packaging.md

@@ -135,8 +135,17 @@ subset. **Not checked: that the `.dmg` builds, mounts or runs**: that needs
 the CI run (Actions, release, Run workflow, this branch) and then a Mac.
 Open items for the trial on a Mac: whether `wanderbooks update` replacing
 the program inside a signed `.app` breaks its signature (it will: step 5
-must decide, probably by updating a whole `.app`); the translocated-app
-check (`translocated_app_refuses_to_connect`) is not built.
+must decide, probably by updating a whole `.app`). **Translocation
+(P11a step 6):** a `.dmg` downloaded from the internet keeps its
+quarantine bit, so Gatekeeper may run the app from a read-only copy under
+`/private/var/folders/…/AppTranslocation/…` that goes away when it
+closes. `wanderbooks connect` (and the viewer's Connect, which is the same
+function) refuses there, before a token is made or an agent's list is
+touched, and says to move the app out of Downloads and open it again:
+`ledger_host::start::translocation_refusal` reads the path the program
+would give the agent. Checked on Linux by standing in for that path
+(`translocated_app_refuses_to_connect`, `only_a_translocated_path_refuses_an_agent`);
+the real Gatekeeper copy still needs the trial on a Mac.
 
 ## Updates staged by the host (step 4)
 
@@ -148,9 +157,23 @@ first; `wanderbooks update` applies it too and reuses the staged copy;
 `update --check` says "already downloaded". A local release is named by
 `<root>/updates/feed` (a `file://` address, then the key file). Without a
 compiled-in release key and without that file, the look does nothing but
-log why. Not built: the in-app "restart now to update" choice and the
-viewer's notice, which need an admin-socket intent and a place in the
-viewer (see the unit's As-built block).
+log why.
+
+The owner accepts a staged update **in the app** (P11a step 4). The
+viewer reads `<root>/updates/staged/meta.json` every few seconds
+(`Owner::update_waiting`) and shows a standing notice above the page,
+"Version X of wanderbooks is ready", with "Update now"; Books also has
+"Check for updates" (`Owner::check_for_updates`, which looks at the feed
+at once whatever the daily look did) and "Update to X" while one waits.
+Accepting sends the host's lease intent `apply_update`; the host installs
+the staged copy exactly as `wanderbooks update` does and its existing
+watch for a replaced program (host.rs INVARIANT 7) restarts onto it once
+no call is running, the books staying open and every holder's session
+carrying on. With no host running there is no call to cut off, so the
+viewer applies it itself. `books.start` tells an agent the same thing
+(`update_waiting`) and adds a next step to tell the human; no tool can
+accept it. The accepted update replaces the program file, not a whole
+`.app`, which step 5 must revisit for a signed bundle.
 
 ## What `update` and `rollback` need from a release
 

docs/testing.md

@@ -3856,6 +3856,51 @@ add), `swap_in`'s temporary-then-rename (`update_is_atomic`), `healthy`
 `parse_version`'s rejections.
 *(Consolidated, with the other units' targets, in "P12: the checklists" at the end of this file.)*
 
+## P11a steps 4 and 6: the in-app accept, the viewer's notice, translocation (2026-11-05)
+
+The accept is the host's lease intent `apply_update` (the name
+`plan/served.md` 8.0.3 allocates); the viewer's names are
+`Owner::update_waiting`, `Owner::check_for_updates` and `Owner::apply_update`,
+and the agent's is `books.start`'s `update_waiting`.
+
+- `crates/ledger-cli/tests/update.rs` (Linux):
+  `books_start_says_an_update_waits` — a quiet `books.start` has no
+  `update_waiting`; after the host stages a signed 9.0.0, `books.start`
+  names its version and staged time and says only the owner accepts it,
+  its next step says to tell the human, and no path appears in the answer;
+  `the_owner_accepts_a_staged_update_in_the_app` — accepting with nothing
+  staged is refused and changes nothing; once 9.0.0 is staged, the same
+  intent (`opener::ask_once_within` with `Intent::ApplyUpdate`, what the
+  viewer's `apply_update` sends) installs it, the program becomes the
+  release's bytes, the old version is kept under `updates/previous/`, and
+  an agent's bridge writes all through the host's restart onto it: every
+  account is in the chart exactly once.
+- `crates/ledger-gui/tests/update_notice.rs`:
+  `the_menu_checks_for_updates_and_a_waiting_update_shows_a_notice_that_accepts`
+  (Books, Check for updates asks the owner and its words show; the standing
+  notice names the version; Update now asks the owner to apply it, and the
+  notice goes once it is installed) and
+  `books_outside_a_data_root_have_no_update_notice`.
+- `crates/ledger-cli/tests/translocation.rs`:
+  `translocated_app_refuses_to_connect` — with the program's path standing
+  in for Gatekeeper's copy (`APPIMAGE` names a file under
+  `AppTranslocation`), `connect claude` is refused before a token is made
+  or a home is made, and the stand-in agent never runs; the same program at
+  an ordinary path connects. `crates/ledger-host/src/start.rs`:
+  `only_a_translocated_path_refuses_an_agent` (the marker is a path part,
+  not letters in a name).
+
+Not checked here: the real Gatekeeper copy and the `.dmg` (needs a Mac,
+the owner's trial); the Windows installer job is P11c's, not on this branch.
+
+**For P12 (mutation targets, none run, D-33):** `update_waiting`'s
+"newer than this program" comparison (a mutant that offers the running
+version must die on `books_start_says_an_update_waits`'s quiet first
+call), `staged_update_in`'s plausibility check (a staged version with a
+path separator must not become a notice), and `translocation_refusal`'s
+component comparison (a part that merely contains the word must not
+refuse).
+
 ## P5: the agent surface (2026-10-29)
 
 Every tool result carries the envelope (`next_steps`, `guards`, `warnings`,

plan/served.md

@@ -1645,7 +1645,7 @@ Each unit follows the 8.0.4 template. "A-n" is an owner answer numbered in 8.3.1
 
 #### P11a: packaging and updates (D-19, D-22, D-24, D-25, D-26)
 
-1. **Status:** in progress: step 0 landed 2026-10-29 (`5e220cca`) as far as the macOS store and the portable CI job; its keyring stores are removed by U0e (D-63), and the Windows half of step 0 moved to P11c (D-62). Steps 1 to 7 open, macOS and Linux first. P11 was split 2026-10-26 (D-54): P11a is installers and updates; P11b the agent dock and books homes.
+1. **Status:** in progress: steps 0-4 and the macOS half of step 6 landed 2026-10-29 (the AppImage restart, the daily staged update, the unsigned `.dmg` job); the in-app accept, the viewer's update notice and "Check for updates", and the translocation refusal landed 2026-11-05. Step 5 (signing) is deferred by D-64; left: the release workflow's first run (the owner's click), the Windows installer (P11c's), the trials on a Mac and a Windows machine. P11 was split 2026-10-26 (D-54): P11a is installers and updates; P11b the agent dock and books homes.
 2. **Depends on:** none in code. From the owner before the signing steps: the Apple Developer ID certificate and notarization credentials as CI secrets; the Windows signing identity (Azure Artifact Signing if eligible, else an OV certificate); GitHub Releases enabled on the public mirror; the release hardware token; clean VMs or runners for the install tests. Q-4 (keep the two-key release manifest of D-25, or minisign alone) before step 5.
 3. **Feature and schema:** none.
 4. **Build:**
@@ -1660,7 +1660,7 @@ Each unit follows the 8.0.4 template. "A-n" is an owner answer numbered in 8.3.1
 5. **Files:** owns `crates/ledger-host/src/update.rs`, `deploy/packaging/*`, `.github/workflows/release.yml`, `docs/packaging.md`; touches `commands.rs`, `crates/ledger-gui/src/owner.rs`, `mise.toml`.
 6. **Tests and proofs:** named above.
 7. **Done when:** (1) on a clean Linux VM the AppImage installs, opens, onboards and posts an entry with no terminal and no admin password, and updates itself from a test feed; (2) on Arch, Debian and Fedora the packages install and upgrade with the head unchanged; (3) an update leaves every book's head and goldens unchanged and a bridge session carries on across it; (4) a backup made on one system restores on another; (5) macOS and Windows: the same as (1), once the signing prerequisites exist (record which are done in the As-built block); (6) `just check` green.
-8. **As built:** (steps 0 to 3 as far as stated, 2026-10-29; steps 4 to 7 are later waves.) **Step 0, partly.** Built: the macOS login Keychain store (`apple-native-keyring-store` 1.0.2, feature `keychain`) and the Windows Credential Manager store (`windows-native-keyring-store` 1.1.0) behind `tokens.rs::Keeper`, on the same `Items` trait and the same laws as the Secret Service (`os` modules per OS; shared `refused`, `make_in`, `read_item`, `remove_item`); `NOT_YET` now only for other OSes; the ignored `os_keyring_keeps_and_forgets` compiles on all three; the `portable` job in `.github/workflows/check.yml` (`macos-latest` gating, `windows-latest` allowed to fail) builds `ledger-cli --no-default-features`, `cargo build --workspace --all-targets`, `cargo test --workspace` and the ignored keyring test. Checked here: Linux only (fmt, clippy, the tokens tests); no macOS/Windows target is installed, so both stores and the job are proven only by the first CI run. **Not built, and not a `cfg` gap: the Windows host.** Windows data root from the known-folder API with an owner-only DACL, named pipes with a SID check, `flock` and the Unix-only `host`, `start`, `bridge`, `opener` and `local`/`admin` sockets are a port of several crates (inventory in `docs/packaging.md`); macOS needs the CI run to show which Linux-only items (`seccomp` in `refuse.rs`, `renameat2`, `close_range`) need fences. So the step 0 Done-when ("setup ... gui work on each OS") is open for both. **Step 1 (the trial): not run in that wave**: it needs clean macOS, Windows and Linux machines; `mise.toml` now pins `cargo-packager` 0.11.8, `cargo-packager-updater` 0.2.3, `cargo-generate-rpm` 0.21.1 and `docs/packaging.md` holds the empty table and what is known. **Steps 1 (Linux half), 2 and 3 (2026-10-29, branch `P11a`).** *Pins:* the EM removed step 0's early pins; `mise.toml` now pins `cargo-packager` 0.11.8 and `cargo-generate-rpm` 0.21.1, which `just package-linux` calls; **`cargo-packager-updater` is a library, not a tool, so it is not pinned** (the plan's three-tool list was wrong on that); `update.rs` verifies with `minisign-verify` 0.3 (the crate the updater uses) and the tests sign with the `minisign` 0.10 dev-dependency. *Step 1:* `docs/packaging.md` has the Linux rows filled from real builds (47 MB .deb, 36 MB .rpm, 44 MB AppImage, the pacman tarball and PKGBUILD) and eight findings; the `.dmg` and NSIS rows stay "(trial)" (need a Mac and Windows; Windows is P11c). The findings that shaped the build: a binary linked on this machine (glibc 2.44) does not start on Debian 13, so packages are built on `ubuntu-24.04` in CI and in `rust:1.99-trixie` locally (`just release-trixie`); the books refuse to run under Docker's default seccomp filter (tests use `seccomp=unconfined`); an AppImage's launcher appends arguments to the desktop file's `Exec`, so the desktop files say plain `wanderbooks` and a bare launch with no terminal is the viewer (`main.rs::is_bare_launch`); the AppImage needs a square icon (**a placeholder PNG is committed; the owner should replace it**). *Step 2:* `crates/ledger-host/src/update.rs` (`update`, `rollback`) and the two CLI modes: a manifest (version; per platform `url`, `sha256`, `signature` = base64 of the minisign `.sig`, the shape cargo-packager signs in), accepted only if higher, sha256 equal AND signature valid against `WANDERBOOKS_RELEASE_PUBKEY` (compiled in; **no build carries one until step 5**, so today a build updates only from a `file://` feed with `--trusted-key`); stage under `<root>/updates/<version>/`, keep the running version under `updates/previous/` with the journal format it knew, swap by renaming a complete copy made beside the target, `--help` health check with automatic put-back; `rollback` refuses when a book declares a format or feature the kept version lacks; a package marks itself with `share/wanderbooks/install-method` and then both refuse. The restart is the host's existing one (nothing new in `host.rs`). Tests: `crates/ledger-cli/tests/update.rs` (`update_is_atomic`, `failed_update_rolls_back`, `unsigned_update_refused`, `bridge_survives_update`, `update_waits_for_a_running_call`, `package_managed_install_refuses_update`, `rollback_refuses_after_a_book_consented_to_a_newer_format`, `an_update_replaces_the_program_keeps_the_old_one_and_rollback_brings_it_back`) all pass (8 in 12 s); five unit tests in `update.rs`. *Step 3:* `deploy/packaging/` (`packager.toml`, the rpm table in `crates/ledger-cli/Cargo.toml`, `aur/PKGBUILD`, `build-linux.sh`, `repo-indexes.sh`, `local-release.sh`, `test-linux-packages.sh`), the `just` recipes `package-linux`, `local-release`, `release-trixie`, `test-linux-packages`, and `.github/workflows/release.yml` (Linux packages on a `v*` tag, attached to the release, apt and dnf indexes pushed to `gh-pages`; untested, GitHub only). `linux_packages_install_and_upgrade` is `test-linux-packages.sh`: install 0.1.0 from an apt, a dnf repository and `makepkg` over the AUR PKGBUILLine truncated
+8. **As built:** (steps 0 to 3 as far as stated, 2026-10-29; steps 4 to 7 are later waves.) **Step 0, partly.** Built: the macOS login Keychain store (`apple-native-keyring-store` 1.0.2, feature `keychain`) and the Windows Credential Manager store (`windows-native-keyring-store` 1.1.0) behind `tokens.rs::Keeper`, on the same `Items` trait and the same laws as the Secret Service (`os` modules per OS; shared `refused`, `make_in`, `read_item`, `remove_item`); `NOT_YET` now only for other OSes; the ignored `os_keyring_keeps_and_forgets` compiles on all three; the `portable` job in `.github/workflows/check.yml` (`macos-latest` gating, `windows-latest` allowed to fail) builds `ledger-cli --no-default-features`, `cargo build --workspace --all-targets`, `cargo test --workspace` and the ignored keyring test. Checked here: Linux only (fmt, clippy, the tokens tests); no macOS/Windows target is installed, so both stores and the job are proven only by the first CI run. **Not built, and not a `cfg` gap: the Windows host.** Windows data root from the known-folder API with an owner-only DACL, named pipes with a SID check, `flock` and the Unix-only `host`, `start`, `bridge`, `opener` and `local`/`admin` sockets are a port of several crates (inventory in `docs/packaging.md`); macOS needs the CI run to show which Linux-only items (`seccomp` in `refuse.rs`, `renameat2`, `close_range`) need fences. So the step 0 Done-when ("setup ... gui work on each OS") is open for both. **Step 1 (the trial): not run in that wave**: it needs clean macOS, Windows and Linux machines; `mise.toml` now pins `cargo-packager` 0.11.8, `cargo-packager-updater` 0.2.3, `cargo-generate-rpm` 0.21.1 and `docs/packaging.md` holds the empty table and what is known. **Steps 1 (Linux half), 2 and 3 (2026-10-29, branch `P11a`).** *Pins:* the EM removed step 0's early pins; `mise.toml` now pins `cargo-packager` 0.11.8 and `cargo-generate-rpm` 0.21.1, which `just package-linux` calls; **`cargo-packager-updater` is a library, not a tool, so it is not pinned** (the plan's three-tool list was wrong on that); `update.rs` verifies with `minisign-verify` 0.3 (the crate the updater uses) and the tests sign with the `minisign` 0.10 dev-dependency. *Step 1:* `docs/packaging.md` has the Linux rows filled from real builds (47 MB .deb, 36 MB .rpm, 44 MB AppImage, the pacman tarball and PKGBUILD) and eight findings; the `.dmg` and NSIS rows stay "(trial)" (need a Mac and Windows; Windows is P11c). The findings that shaped the build: a binary linked on this machine (glibc 2.44) does not start on Debian 13, so packages are built on `ubuntu-24.04` in CI and in `rust:1.99-trixie` locally (`just release-trixie`); the books refuse to run under Docker's default seccomp filter (tests use `seccomp=unconfined`); an AppImage's launcher appends arguments to the desktop file's `Exec`, so the desktop files say plain `wanderbooks` and a bare launch with no terminal is the viewer (`main.rs::is_bare_launch`); the AppImage needs a square icon (**a placeholder PNG is committed; the owner should replace it**). *Step 2:* `crates/ledger-host/src/update.rs` (`update`, `rollback`) and the two CLI modes: a manifest (version; per platform `url`, `sha256`, `signature` = base64 of the minisign `.sig`, the shape cargo-packager signs in), accepted only if higher, sha256 equal AND signature valid against `WANDERBOOKS_RELEASE_PUBKEY` (compiled in; **no build carries one until step 5**, so today a build updates only from a `file://` feed with `--trusted-key`); stage under `<root>/updates/<version>/`, keep the running version under `updates/previous/` with the journal format it knew, swap by renaming a complete copy made beside the target, `--help` health check with automatic put-back; `rollback` refuses when a book declares a format or feature the kept version lacks; a package marks itself with `share/wanderbooks/install-method` and then both refuse. The restart is the host's existing one (nothing new in `host.rs`). Tests: `crates/ledger-cli/tests/update.rs` (`update_is_atomic`, `failed_update_rolls_back`, `unsigned_update_refused`, `bridge_survives_update`, `update_waits_for_a_running_call`, `package_managed_install_refuses_update`, `rollback_refuses_after_a_book_consented_to_a_newer_format`, `an_update_replaces_the_program_keeps_the_old_one_and_rollback_brings_it_back`) all pass (8 in 12 s); five unit tests in `update.rs`. *Step 3:* `deploy/packaging/` (`packager.toml`, the rpm table in `crates/ledger-cli/Cargo.toml`, `aur/PKGBUILD`, `build-linux.sh`, `repo-indexes.sh`, `local-release.sh`, `test-linux-packages.sh`), the `just` recipes `package-linux`, `local-release`, `release-trixie`, `test-linux-packages`, and `.github/workflows/release.yml` (Linux packages on a `v*` tag, attached to the release, apt and dnf indexes pushed to `gh-pages`; untested, GitHub only). `linux_packages_install_and_upgrade` is `test-linux-packages.sh`: install 0.1.0 from an apt, a dnf repository and `makepkg` over the AUR PKGBUILLine truncated
 
 #### P11b: the agent dock and books homes (D-27)