fix: Sync Complete notification firing repeatedly (0.11.1:6)

[helix-nine]

Summary

• Bug: the Sync Complete notification was firing every few minutes instead of once per install.
• Cause: startos/main.ts read the store once at setupMain start and captured store in the synced-true oneshot's closure. After the first notification fired, storeJson.merge(effects, { syncNotified: true }) persisted the flag to disk but never refreshed the in-memory store reference. When the sync health check transitioned !success → success again (the bash TCP probe is sensitive enough to flap), HealthDaemon re-fired the oneshot, the captured store.syncNotified was still false, and a new notification was posted. Confirmed in the installed SDK: a oneshot whose requires dep flaps gets restarted via changeRunning(true) → start() → runLoop, re-invoking exec.fn.
• Fix: read storeJson fresh inside the oneshot's fn so the persisted flag is honored on re-invocations within a single setupMain lifecycle.
• Release: 0.11.1:5 → 0.11.1:6, renamed in place (no migration); the prior config.yaml → toml migration is carried unchanged.

Test plan

• npm run check clean
• make x86 builds electrs_x86_64.s9pk v0.11.1:6
• Smoke-install on a test box; confirm a single Sync Complete notification appears when the index finishes and no further notifications fire as the sync health check polls (or restarts via bitcoin cookie rotation)

[helix-nine]

@matthill — you were right. Force-pushed a redo following the LND pattern from lnd-startos#162:

• Dedicated startos/fileModels/syncNotified.json.ts. (syncNotified was the only field in store.json, so retired store.json along with it.)
• main.ts reads once into let notified at startup; the oneshot checks the closure flag, posts the notification on first fire, writes sync-notified.json, and sets notified = true. Closure flag is the source of truth within a main lifecycle; the on-disk flag re-seeds it on next startup.

Still 0.11.1:6, still no migration, prior config.yaml → toml migration carried unchanged. npm run check clean, make x86 builds.

[helix-nine]

Thanks for the review, @MattDHill — shipped as 0.11.1:6.