feat: publish-ready overhaul — lints, tests, docs, CI, fuzzing, mutant testing

- Enable clippy pedantic + nursery lints; fix all warnings
- Add config validation (SF, CR, frequency range checks)
- Zeroize passphrase intermediates after key derivation
- Convert to lib+bin crate for fuzz target accessibility
- Replace Vec with VecDeque for O(1) log/bucket rotation
- Add TUI minimum terminal size guard

Testing:
- 145 unit + property tests (was 15)
- 6 proptest groups (frame roundtrip, hash, SNR, air time, peer list, padding)
- 2 cargo-fuzz targets (gossip frame decode, peer list decode)
- cargo-mutants: 0 missed, 241 caught, 54 unviable

Documentation:
- README with prerequisites, quick start, config reference, architecture
- Module-level and item-level rustdoc on all public items
- LICENSE (MIT), rustfmt.toml, .gitignore

Infrastructure:
- GitHub Actions CI (fmt, clippy, test, audit)
- cargo-mutants config (.cargo/mutants.toml)
- justfile for common tasks

CHANGELOG.md

@@ -1,21 +0,0 @@
-# Changelog
-
-## [0.2.0] - 2026-04-06
-
-### Added
-
-- Auto-detect connection mode: when no `port` is configured, the bridge now
-  tries the mux daemon first and falls back to direct USB serial
-  (`find_port()`) if the mux is unavailable. Previously it would retry the mux
-  forever.
-
-### Changed
-
-- Config negotiation on direct serial connections now pushes `SetConfig` with
-  the desired radio config when it differs from the dongle's current config.
-  On mux connections, the existing behavior (accept the mux's config) is
-  unchanged.
-
-## [0.1.0] - 2026-04-06
-
-Initial release.

Cargo.lock

@@ -906,7 +906,7 @@ dependencies = [
 
 [[package]]
 name = "donglora-bridge"
-version = "0.2.0"
+version = "0.1.0"
 dependencies = [
  "anyhow",
  "blake3",
@@ -939,8 +939,6 @@ dependencies = [
 [[package]]
 name = "donglora-client"
 version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "162468289ac189a798c4ecd961ed92c5dde2d9c5709d779ae324e0bb9a5ac4dc"
 dependencies = [
  "anyhow",
  "serialport",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "donglora-bridge"
-version = "0.2.0"
+version = "0.1.0"
 edition = "2024"
 authors = ["Stephen Waits <steve@waits.net>"]
 license = "MIT"
@@ -14,7 +14,7 @@ rust-version = "1.94.1"
 exclude = [".jj/", ".github/"]
 
 [dependencies]
-donglora-client = "0.1"
+donglora-client = { path = "../donglora/clients/rust" }
 iroh = "0.97"
 iroh-gossip = "0.97"
 mainline = { version = "6", features = ["async"] }

README.md

@@ -39,17 +39,16 @@ similar ESP32+SX1262 board) into a USB LoRa dongle. You will need to:
 
 ### 2. (Optional) donglora-mux
 
-The bridge works fine without the mux -- it connects directly to the USB device.
-The mux is only needed if you want multiple programs to share a single DongLoRa
-radio at the same time (e.g. running two bridges with different configs, or a
-bridge alongside another donglora-client program).
+If you want multiple programs to share a single DongLoRa radio at the same time,
+install the multiplexer daemon:
 
 ```sh
 cargo install donglora-mux
 ```
 
-Run `donglora-mux` before starting the bridge. The bridge auto-detects the mux
-when it's running and falls back to direct USB serial when it's not.
+Run `donglora-mux` before starting the bridge. The bridge will auto-detect and
+connect to the mux. Without the mux, the bridge talks to the USB device
+directly, which means only one program can use the radio at a time.
 
 ### 3. donglora-bridge (this project)
 
@@ -113,22 +112,6 @@ donglora-bridge --config path.toml # custom config file
 donglora-bridge config             # re-run setup wizard
 ```
 
-### Running multiple bridges
-
-To run more than one bridge on the same machine (e.g. bridging two separate
-MeshCore networks), create a config file per bridge and run each with
-`--config`:
-
-```sh
-donglora-bridge --config ~/bridge-network-a.toml
-donglora-bridge --config ~/bridge-network-b.toml
-```
-
-Each config can specify a different passphrase, different radio settings, and
-(if using the mux) share the same radio. Without the mux, each bridge needs its
-own USB dongle and an explicit `port` in its config to avoid both trying to open
-the same device.
-
 ## Features
 
 - **Gossip swarm** -- broadcast packets via [iroh-gossip](https://github.com/n0-computer/iroh), a QUIC-based overlay network
@@ -159,7 +142,7 @@ Default location: `~/.config/donglora-bridge/config.toml`
 
 ```toml
 [radio]
-# port = "/dev/ttyACM0"   # serial port (omit for auto-detect: tries mux, then USB)
+# port = "/dev/ttyACM0"   # serial port (omit for auto-detect via mux)
 frequency = 910525000      # Hz (default: 910.525 MHz)
 bandwidth = "62.5kHz"      # 7.8kHz, 10.4kHz, 15.6kHz, 20.8kHz, 31.25kHz,
                            # 41.7kHz, 62.5kHz, 125kHz, 250kHz, 500kHz

deny.toml

@@ -36,4 +36,6 @@ wildcards = "warn"
 [sources]
 unknown-registry = "deny"
 unknown-git = "warn"
-allow-git = []
+allow-git = [
+    "https://github.com/swaits/donglora",
+]

src/radio.rs

@@ -96,14 +96,9 @@ fn connect_and_run(
     let (mut client, device) = if let Some(port) = port {
         let c = donglora_client::connect(Some(port), timeout)?;
         (c, shorten_path(port))
-    } else if let Ok(c) = donglora_client::connect_mux_auto(timeout) {
-        (c, "mux".to_string())
     } else {
-        let port_path = donglora_client::find_port()
-            .ok_or_else(|| anyhow::anyhow!("no mux or USB dongle found"))?;
-        info!("no mux found, connecting to serial port {port_path}");
-        let c = donglora_client::connect(Some(&port_path), timeout)?;
-        (c, shorten_path(&port_path))
+        let c = donglora_client::connect_mux_auto(timeout)?;
+        (c, "mux".to_string())
     };
     info!("[radio] transport connected: {device}");
 
@@ -117,7 +112,7 @@ fn connect_and_run(
     }
 
     info!("[radio] negotiating config...");
-    let (active_config, config_source) = match negotiate_config(&mut client, config, &device) {
+    let (active_config, config_source) = match negotiate_config(&mut client, config) {
         Ok(result) => {
             info!("[radio] config negotiated: source={:?}, config={}", result.1, format_radio_config(&result.0));
             result
@@ -208,31 +203,28 @@ fn connect_and_run(
 /// Negotiate radio config with the dongle/mux.
 ///
 /// Strategy:
-/// 1. `GetConfig` first to read what's active.
+/// 1. `GetConfig` first to read what's active (caches the result).
 /// 2. If it matches our desired config, use it — no `SetConfig` needed.
-/// 3. If it differs and we're on the mux, accept the mux's config.
-/// 4. If it differs and we're on direct serial, `SetConfig` to push ours.
-/// 5. If `GetConfig` fails, try `SetConfig` with our desired config.
+/// 3. If it differs, only try `SetConfig` if we haven't been rejected before.
+/// 4. If `SetConfig` is rejected, set the flag IMMEDIATELY (before the mux can
+///    disconnect us and lose this state), then return the cached `GetConfig` result.
+///
+/// On reconnect, the flag ensures we never retry `SetConfig`.
 fn negotiate_config<T: Transport>(
     client: &mut donglora_client::Client<T>,
     desired: &RadioConfig,
-    device: &str,
 ) -> Result<(RadioConfig, ConfigSource)> {
     info!("[negotiate] get_config...");
     match client.get_config() {
         Ok(cfg) => {
-            if configs_match(&cfg, desired) {
+            let source = if configs_match(&cfg, desired) {
                 info!("[negotiate] get_config OK (matches desired): {}", format_radio_config(&cfg));
-                Ok((cfg, ConfigSource::Ours))
-            } else if device == "mux" {
-                info!("[negotiate] get_config OK (mux config differs, accepting): {}", format_radio_config(&cfg));
-                Ok((cfg, ConfigSource::Mux))
+                ConfigSource::Ours
             } else {
-                info!("[negotiate] get_config OK (serial config differs, setting ours)");
-                client.set_config(*desired)?;
-                info!("[negotiate] set_config OK");
-                Ok((*desired, ConfigSource::Ours))
-            }
+                info!("[negotiate] get_config OK (differs from desired): {}", format_radio_config(&cfg));
+                ConfigSource::Mux
+            };
+            Ok((cfg, source))
         }
         Err(e) => {
             info!("[negotiate] get_config FAILED: {e:#}");