move pi-mono into companion-cloud as apps/companion-os

- Copy all pi-mono source into apps/companion-os/
- Update Dockerfile to COPY pre-built binary instead of downloading from GitHub Releases
- Update deploy-staging.yml to build pi from source (bun compile) before Docker build
- Add apps/companion-os/** to path triggers
- No more cross-repo dispatch needed

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/pi-teams/progress.md

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+# Progress Log: Separate Windows Mode Implementation
+
+## 2026-02-26
+
+### Completed
+
+- [x] Researched terminal window title support for iTerm2, WezTerm, tmux, Zellij
+- [x] Clarified requirements with user:
+  - True separate OS windows (not panes/tabs)
+  - Team lead also gets separate window
+  - Title format: `team-name: agent-name`
+  - iTerm2: use window title property via escape sequences
+  - Implementation: optional flag + global setting
+  - Skip tmux and Zellij for now
+- [x] Created comprehensive task_plan.md with 10 phases
+- [x] Created findings.md with technical research details
+
+### Next Steps
+
+1. ✅ Phase 1: Update Terminal Adapter Interface - COMPLETE
+2. ✅ Phase 2: iTerm2 Window Support - COMPLETE
+3. ✅ Phase 3: WezTerm Window Support - COMPLETE
+4. ✅ Phase 4: Terminal Registry - COMPLETE
+5. ✅ Phase 5: Team Configuration - COMPLETE
+6. ✅ Phase 6: spawn_teammate Tool - COMPLETE
+7. ✅ Phase 7: spawn_lead_window Tool - COMPLETE
+8. ✅ Phase 8: Lifecycle Management (killTeammate, check_teammate updated) - COMPLETE
+9. ✅ Phase 9: Testing - COMPLETE (all 8 tests pass, TypeScript compiles)
+10. Phase 10: Documentation
+
+### Blockers
+
+None
+
+### Decisions Made
+
+- Use escape sequences (`\033]2;Title\007`) for iTerm2 window titles since AppleScript window.title is read-only
+- Add new `windowId` field to Member model instead of reusing `tmuxPaneId`
+- Store `separateWindows` global setting in TeamConfig
+- Skip tmux/Zellij entirely (no fallback attempted)