feat(sync): headless --sync-cli mode so sync only needs the app installed

The Electron app now answers launcher-style sync argv (--sync-cli sync
[host|--snapshot|--merge] ... plus --help/--version) at entry, before any
window or display initialization, backed by a libsql binding of the shared
stats-sync engine. Works over SSH with no display server, so a remote
machine no longer needs the bun launcher. The launcher accepts --sync-cli
as a no-op so both invocation shapes stay equivalent.

launcher/test-support/immersion-db-schema.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"immersion-db-schema.d.ts","sourceRoot":"","sources":["immersion-db-schema.ts"],"names":[],"mappings":"AAGA,eAAO,MAAM,wBAAwB,+rYA+TpC,CAAC"}