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/templates/brief.md

@@ -0,0 +1,26 @@
+---
+class: strategic # strategic | technical | hotfix
+---
+
+# Brief: <title>
+
+## Source
+
+<PRD reference or requestor>
+
+## Scope
+
+<What this brief covers>
+
+## Success Criteria
+
+- [ ] <Criterion 1>
+- [ ] <Criterion 2>
+
+## Dependencies
+
+- <Other briefs or external dependencies>
+
+## Notes
+
+<Any additional context>