PR 16580, Linux x64, Node 24.21.0
Verified head d2a60b6a156a99d0c0daed0cd618d5ee999cc77b
Production ProviderInstanceRegistryHydration.layer + actual registry, current providerInstances fixtures.
Before main: startup save assertion fails, ghost_late absent.
Before original PoC: failed authoritative read replays ghost_stale instead of retaining ghost_current.
After: 73 registry + 6 derivation tests pass.
All 70 registry baseline tests retained; original 2 additions replaced by 3 deterministic cases.
Deferred/PubSub drain barriers; no sleeps/polling.
Targeted lint, format check and server typecheck pass.
Independent full-diff review: Opus5.5 and GPT6Sol, no code blockers; obsolete PR-body fallback wording corrected.
App server started and paired; browser tab disappeared repeatedly on settings navigation. No app race verification or usable screenshot.
Native Windows/macOS/iOS/Android/Electron not verified.