feat: monorepo consolidation — forge pipeline, MACP protocol, framework plugin, profiles/guides/skills

Work packages completed:
- WP1: packages/forge — pipeline runner, stage adapter, board tasks, brief classifier,
  persona loader with project-level overrides. 89 tests, 95.62% coverage.
- WP2: packages/macp — credential resolver, gate runner, event emitter, protocol types.
  65 tests, 96.24% coverage. Full Python-to-TS port preserving all behavior.
- WP3: plugins/mosaic-framework — OC rails injection plugin (before_agent_start +
  subagent_spawning hooks for Mosaic contract enforcement).
- WP4: profiles/ (domains, tech-stacks, workflows), guides/ (17 docs),
  skills/ (5 universal skills), forge pipeline assets (48 markdown files).

Board deliberation: docs/reviews/consolidation-board-memo.md
Brief: briefs/monorepo-consolidation.md

Consolidates mosaic/stack (forge, MACP, bootstrap framework) into mosaic/mosaic-stack.
154 new tests total. Zero Python — all TypeScript/ESM.

packages/forge/examples/sample-brief.md

@@ -0,0 +1,30 @@
+---
+class: technical
+---
+
+# Brief: Add User Preferences API Endpoint
+
+## Source PRD
+
+mosaic-stack PRD — Mission Control Dashboard
+
+## Scope
+
+Add a REST endpoint for storing and retrieving user dashboard preferences (layout, theme, sidebar state). This enables the Mission Control dashboard to persist user customization.
+
+## Success Criteria
+
+1. GET /api/users/:id/preferences returns stored preferences (JSON)
+2. PUT /api/users/:id/preferences stores/updates preferences
+3. Preferences persist across sessions
+4. Default preferences returned for users with no stored preferences
+5. Only the authenticated user can read/write their own preferences
+
+## Estimated Complexity
+
+Medium — new endpoint, new DB table, auth integration
+
+## Dependencies
+
+- Requires existing auth system (JWT guards)
+- Requires existing user entity in database