fix(ci): correct future FNXC stamps (#3440)

## Summary
- replaces newly added future-dated FNXC metadata with the actual UTC
change time
- tightens the FNXC future-date baseline to zero known exceptions

## Test plan
- `pnpm check:fnxc-future-dates`
- `pnpm check:lifecycle-columns`
- `pnpm check:changesets`
- `pnpm --filter @runfusion/fusion exec vitest run
src/__tests__/staged-plugin-core-imports.test.ts --silent=passed-only
--reporter=dot`
- `pnpm --filter @fusion/engine typecheck`
- `pnpm lint`

scripts/lib/fnxc-future-dates-baseline.json

@@ -1,14 +1 @@
-{
-  "packages/core/src/async-stores/async-chat-store.ts": 4,
-  "packages/core/src/async-stores/async-mission-store.ts": 1,
-  "packages/core/src/chat/chat-store.ts": 1,
-  "packages/core/src/postgres/migrations/0036_chat_session_tags.sql": 2,
-  "packages/dashboard/app/App.tsx": 1,
-  "packages/dashboard/app/components/AgentDetailView.css": 1,
-  "packages/dashboard/app/components/ChatView.css": 2,
-  "packages/dashboard/app/components/TaskDetailModal.css": 1,
-  "packages/dashboard/vitest.config.ts": 1,
-  "packages/engine/src/project-engine.ts": 1,
-  "packages/engine/src/triage.ts": 2,
-  "docs/workflow-steps.md": 1
-}
+{}