BUG 1: feature-flags.ts had 3 wrong flag names + missing 3 from seed.ts
- Removed: browser_extension_enabled, institutional_knowledge_enabled
- Renamed: connectors_enabled → mcp_connectors_enabled
- Added: llm_multi_model_enabled, telemetry_enabled, platform_auth_required
- Fixed defaults to match seed.ts (marketplace_enabled=true, dispatch_api_enabled=true)
- Now 13 flags exactly matching platform-service/src/modules/flags/seed.ts
BUG 2: ipc-bridge.ts call() had 'initialize' exemption that allowed null deref
- If call('initialize') was invoked externally without start(), the guard
passed but this.child!.stdin!.write() would crash with null dereference
- During normal start(), child.stdin.writable is true so no exemption needed
- Removed the method !== 'initialize' exemption
BUG 3: health routes didn't factor IPC bridge into overall health status
- allOk only checked platform-service reachability
- Now allOk = depsOk && ipcConnected — service reports 503 when bridge is down
- IPC bridge disconnection makes health 'degraded' (correct — fallback mode works)
24 tests passing, typecheck clean.
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