merge: P11a step 0, the macOS and Windows keyring stores and the portable CI job (branch P11a, ee4f8cd5)

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

plan/served.md

@@ -1596,7 +1596,7 @@ 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:** none yet.
+8. **As built:** (steps 0 and 1 only, 2026-10-29; steps 2 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**: 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.
 
 #### P11b: the agent dock and books homes (D-27)