watchsettings.c: resync in-stage BGM (track 1) on Music commit and level entry (D355)

docs/dev/WATCH-SETTINGS-PLAN.md

@@ -1,6 +1,6 @@
 # Watch-backed settings in PC Options and F10 — proposal for review
 
-Status: **watch-backed subset implemented (D350), robustness fixes landed (D352), Turok-style regrouping done (D353), and front-end F10 routing + transparent default Bond-file selection landed (D354: non-stage contexts use the chooser path, default = explicit pick > `selected_folder_num` > first valid file, with a one-shot `fileBuildWriteNewSave(FOLDER1)` fallback; GE_WSPROBE/GE_WSPROBE_FRONT headless probes).** Wider M3 remains outstanding: master volume, window-mode/display rows, per-section reset (Gate E), key rebinding. PC-only per-file persistence and explicit Bond-file chooser approved; details below. See `docs/dev/findings.md` D350–D354 for verification. This is the watch-integration part of M3, not a replacement for the native watch menu. The older tracked `docs/dev/OPTIONS-MENU-PLAN.md` and local `docs/dev/notes/OPTIONS-MENU-PLAN.md` describe the wider M3 scope (master volume, window mode/display, resets).
+Status: **watch-backed subset implemented (D350), robustness fixes landed (D352), Turok-style regrouping done (D353), front-end F10 routing + transparent default Bond-file selection landed (D354: non-stage contexts use the chooser path, default = explicit pick > `selected_folder_num` > first valid file, with a one-shot `fileBuildWriteNewSave(FOLDER1)` fallback; GE_WSPROBE/GE_WSPROBE_FRONT headless probes), and the in-stage BGM resync landed (D355: the Music commit also drives the track-1 BGM player, matching the game's own MP-path resync; by-ear confirmed).** Wider M3 remains outstanding: master volume, window-mode/display rows, per-section reset (Gate E), key rebinding. PC-only per-file persistence and explicit Bond-file chooser approved; details below. See `docs/dev/findings.md` D350–D355 for verification. This is the watch-integration part of M3, not a replacement for the native watch menu. The older tracked `docs/dev/OPTIONS-MENU-PLAN.md` and local `docs/dev/notes/OPTIONS-MENU-PLAN.md` describe the wider M3 scope (master volume, window mode/display, resets).
 
 ## Goal and ownership
 
@@ -57,4 +57,6 @@ Thus a front-end row that edits only live watch state will be silently undone be
 - **Approved:** PC-UI edits persist per selected Bond file; watch-only edits stay session-only. The front screen gets an explicit file chooser; F10 uses the active file. Preserve stored controller type; toggles/enums save on change, slider drags on release. No `src/game` behavior change or N64 save-format change.
 - **Still separate product decisions:** whether/how to expose GE Screen/Ratio alongside PC video settings; whether to expose control style at all given the port's forced mapping (deferred); whether Bond-file reset needs its own confirmation rather than being bundled with global PC defaults.
 - **Landed 2026-09-27 (D352/D353, port-only):** bridge robustness fixes (D352) and the Turok-style row-table regrouping (D353: six sections — DISPLAY, GRAPHICS, BOND FILE, MOUSE / AIM, CONTROLLER, GAME; the music/FX sliders sit in BOND FILE; the page title annotates the selected file; `buildPages` overflow logs).
-- **Landed 2026-09-27 (D354, port-only):** front-end F10 routing + transparent default Bond-file selection (see item 4 above); in-stage F10 verified working by the `GE_WSPROBE` probe. A standalone AUDIO section (master volume + the config-side volume keys) and per-section reset-to-defaults (Gate E) are the next settings-scope items; key rebinding stays Phase 4.
+- **Landed 2026-09-27 (D354, port-only):** front-end F10 routing + transparent default Bond-file selection (see item 4 above); in-stage F10 verified working by the `GE_WSPROBE` probe.
+- **Landed 2026-09-27 (D355, port-only):** the Music commit now also resyncs the in-stage BGM (track 1) via `musicTrack1ApplySeqpVol`, plus a once-per-activation resync on level entry; by-ear confirmed. N64 watch path unchanged.
+- A standalone AUDIO section (master volume + the config-side volume keys) and per-section reset-to-defaults (Gate E) are the next settings-scope items; key rebinding stays Phase 4.