feat(plane-project-os): integrate Plane multi-layout views, sprint cycles engine, triage intake, pure monochrome SVGs, and LangGraph supervisor multi-agent runtime

- Implemented Plane Multi-Layout Views: Kanban Board (4 columns), Dense List View (Linear style), Spreadsheet Grid View with inline quick edits, and 14-day Timeline Gantt view with 7 agent swimlanes.
- Built Plane Cycles Engine: sprint management (Cycle 102/103), dynamic burn-down calculations, story points tracking, and automated settlement on Founder Gate approval.
- Built Plane Triage Intake Gate: 1-click triage accept, reject with reason, and technical station assignment for founder briefs and swarm subtasks.
- Purged all legacy unicode glyphs and color noise across OrgChartView, replacing with 6 bespoke technical vector SVGs and pure monochrome tokens.
- Integrated LangGraph Supervisor Multi-Agent Engine: 5 specialized sub-graphs (PM Spec, Architect, Coder Sandbox, QA Security, Deliverables) with native HITL interrupt/resume and compaction checkpoints.
- Generated and verified 4 enterprise deliverables (Excel XLSX with SUMIFS, Word DOCX A4 spec, PowerPoint PPTX 16:9, PostgreSQL ACID migration SQL).
- Verified with 12/12 Playwright Plane E2E tests, 20/20 OrgChart tests, 17/17 Bun unit tests, and 0 TypeScript compilation errors.