Fix: feedStore stale endpoint_type via cross-store subscription

[jpeggdev]

Problem

feedStore.toSummary() calls useEndpointStore.getState().endpoints — a point-in-time snapshot with no subscription. If endpoints are subsequently created, updated, deleted, or reloaded on project switch, the endpoint_type on every already-stored RequestSummary goes stale. Components rendering feed rows show incorrect type badges until the feed is also reloaded.

• The stores are loaded in parallel on project switch (AppShell.tsx calls all data loaders in Promise.all)
• No listener exists to sync feedStore when endpoints change
• Store tests mock each store independently, completely missing the integration bug

Proposed Interface

Zero caller changes. The fix adds ~15 lines to feedStore.ts:

1. Add endpoint_id: string | null to RequestSummary type (preserve it through toSummary() instead of discarding after lookup)
2. Add a _reEnrich() internal action that re-maps endpoint_type from current endpointStore.endpoints
3. Add a module-level Zustand subscription:

useEndpointStore.subscribe(
  (s) => s.endpoints,
  () => useFeedStore.getState()._reEnrich(),
  { equalityFn: shallow }
)

_reEnrich implementation:

_reEnrich: () => {
  const endpoints = useEndpointStore.getState().endpoints
  set((s) => {
    const requests = s.requests.map((req) => {
      const type = req.endpoint_id
        ? (endpoints.find((e) => e.id === req.endpoint_id)?.endpoint_type ?? null)
        : null
      return type !== req.endpoint_type ? { ...req, endpoint_type: type } : req
    })
    return { requests, filtered: applyFilters(requests, get().filters) }
  })
}

Components continue reading useFeedStore(s => s.filtered) unchanged.

Dependency Strategy

• Category: In-process (both stores are in-memory Zustand)
• feedStore already imports useEndpointStore (line 3) — no new dependency introduced
• Subscription is one-directional: endpointStore -> feedStore
• endpointStore does not know feedStore exists
• Identity guard preserves object identity for unchanged rows, keeping memo() effective

Testing Strategy

• New boundary tests: Seed requests with endpoint_id, call useEndpointStore.setState({ endpoints: [...] }), assert filtered rows have updated endpoint_type. Test the race condition: load endpoints after feed, verify enrichment fires.
• Old tests to delete: None — existing feedStore tests don't test toSummary() enrichment
• Test environment: Standard Vitest with Zustand stores

Implementation Recommendations

• The module should own the join between request endpoint_id and endpoint endpoint_type
• It should hide the subscription wiring, the re-enrichment trigger, and the identity-preserving update
• It should expose the same filtered / requests interface callers already use
• The endpoint_id field addition to RequestSummary is the only type change
• The request-logged event path (addRequest) still calls toSummary() at event time, which is correct