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/macp/src/event-emitter.ts

@@ -0,0 +1,35 @@
+import { randomUUID } from 'node:crypto';
+import { appendFileSync, mkdirSync } from 'node:fs';
+import { dirname } from 'node:path';
+
+import type { MACPEvent } from './types.js';
+
+export function nowISO(): string {
+  return new Date().toISOString();
+}
+
+export function appendEvent(eventsPath: string, event: MACPEvent): void {
+  mkdirSync(dirname(eventsPath), { recursive: true });
+  appendFileSync(eventsPath, JSON.stringify(event) + '\n', 'utf-8');
+}
+
+export function emitEvent(
+  eventsPath: string,
+  eventType: string,
+  taskId: string,
+  status: string,
+  source: string,
+  message: string,
+  metadata?: Record<string, unknown>,
+): void {
+  appendEvent(eventsPath, {
+    event_id: randomUUID(),
+    event_type: eventType,
+    task_id: taskId,
+    status,
+    timestamp: nowISO(),
+    source,
+    message,
+    metadata: metadata ?? {},
+  });
+}