feat: deliverable review gate, app lifecycle fixes, CI/CD pipeline

- Add deliverable review gate: pause workflow when agents produce important
  documents (PRDs, design docs, etc.) for human review before continuing
- Add company-level reviewDeliverables setting with onboarding card selector
- Block agent heartbeats when deliverable review is pending (agent + CEO)
- Trigger review at document creation time in API server for reliability
- Fix autoApproveHires vs reviewDeliverables conflict in approval-policy
- Fix app quit: force-exit on all platforms (macOS Dock, Windows tray, Linux)
- Add multi-platform CI/CD pipeline (macOS arm64/x64, Windows x64/arm64,
  Linux x64/arm64 with deb/AppImage/rpm/snap) with code signing support

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agent-company",
-  "version": "0.4.80",
+  "version": "0.4.90",
   "private": true,
   "type": "module",
   "description": "Cross-platform Electron desktop control plane for local-first AI agent companies.",