chore(release): v0.34.0

Version bump via changesets.

packages/core/CHANGELOG.md

@@ -1,5 +1,25 @@
 # @fusion/core
 
+## 0.34.0
+
+### Patch Changes
+
+- 6a6c6fd: Dashboard startup and request-storm fixes:
+
+  - **Faster startup**: parallelized independent store inits, started CentralCore init early in background, and ran plugin loading concurrently with extension resolution. The duplicate-runtime root cause is also fixed — `shouldUseHybridExecutor` no longer auto-enables for local-only multi-project setups, where `ProjectEngineManager` already handles project lifecycle (set `FUSION_HYBRID_EXECUTOR=1` to force-enable). Eliminates ~7s of redundant self-healing pipeline work per cold start.
+  - **Per-page request reduction**: added in-flight request dedupe (`packages/dashboard/app/api/dedupe.ts`) wrapped around the top API offenders. A single page load went from ~177 requests to ~101, with `/api/plugins/ui-slots` dropping from 17× to 1×.
+  - **Stale-data-after-mutation hazard**: `forceFresh` option on the deduped fetchers now redirects ALL in-flight waiters to receive the fresh post-mutation response, not just the forcing caller. Generation counters in `useAgents` and `AgentListModal` provide a second layer of protection against slow polls overwriting fresh state.
+  - **SSE refresh storm**: agent SSE event handler now debounces (250ms) with a trailing-edge guard, so multi-agent activity bursts coalesce to at most 2 refetches per burst instead of one per event.
+  - **Live isolation-mode transition**: PATCH `/api/projects/:id` with an `isolationMode` change now returns a 503 with actionable guidance when HybridExecutor is unavailable (local-only single-node), instead of silently persisting a config that the live runtime won't honor.
+  - **Error handling regression**: restored try/catch around `HybridExecutor.initialize` and `engineManager.ensureEngine` in the parallel engine setup so a paused or broken cwd project no longer aborts dashboard startup.
+  - **TaskStore migration race**: sequenced the SQLite store inits (TaskStore → AutomationStore → PluginStore → AgentStore) since they all open the same `.fusion/fusion.db` and run `addColumnIfMissing` migrations with a TOCTOU `hasColumn` → `ALTER` pattern.
+  - **`gh` CLI invocation storm**: `isGhAvailable()` and `isGhAuthenticated()` now memoize their results with a 60s TTL. `GitHubTrackingReconciler` was scanning up to 200 done tasks at startup and calling `hasGhAuth()` per task — each call shelled out to `gh --version` and `gh auth status` (which makes a network roundtrip), pinning the event loop for ~60s of synchronous `spawnSync` work. CPU-profile-confirmed: dropped from 71s (69% of cold-start CPU) to 2s. The cache benefits all 28+ call sites in `dashboard/src/github.ts`, the engine PR monitor, the research provider, and the API routes automatically. `resetGhAvailabilityCache()` is exported for login/logout flows that need to invalidate immediately.
+  - **SQLite integrity check delay**: `PRAGMA integrity_check(100)` walks every page of the database file and was scheduled 3 seconds after init — landing right in the responsiveness-critical window for ~7s per database. Pushed the deferred-check timer to 60 seconds so the user is already interacting with the dashboard by the time it runs. The check itself is unchanged; corruption detection still works.
+  - **Engine init event-loop yields**: `InProcessRuntime.start()` now awaits a `setImmediate`-based yield between major init phases (TaskStore → Plugins → WorktreePool → AgentStore → Scheduler → Executor → HeartbeatMonitor → SelfHealing) so HTTP requests can be processed between them instead of waiting on the entire stack. Same yield is now interleaved between each step of `SelfHealingManager.runStartupRecovery()` (34 steps per project) and its periodic maintenance batches.
+  - **Deferred startup recovery**: `InProcessRuntime.start()` no longer awaits `resumeStartupRecoverySequence()` or `workerManager.reconcileOrphaned()` — both are correctness-preserving background operations and their git/SQLite work was blocking server-listen for several seconds.
+  - **Deferred orphan-task AI agent resumption**: orphaned in-progress tasks resumed at engine restart now wait 30 seconds before spawning their AI agent session (worktree setup + pi-coding-agent session creation is heavy and saturates the event loop). Override via `FUSION_RESUME_ORPHAN_DELAY_MS=<ms>`; auto-zeroes under Vitest.
+  - **Event-loop lag tracer**: opt-in debug aid for diagnosing cold-start regressions. Set `FUSION_TRACE_EL_LAG=/path/to/file.txt` to capture every block >150ms with a timestamp relative to process start.
+
 ## 0.33.0
 
 ### Minor Changes

packages/core/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@fusion/core",
-  "version": "0.33.0",
+  "version": "0.34.0",
   "license": "MIT",
   "description": "Fusion core: task store, scheduler, settings, and shared domain types backing the Fusion AI coding agent.",
   "homepage": "https://github.com/Runfusion/Fusion#readme",