Merge feature/bun-instead-of-pm2: PM2 to Bun migration v7.1.0

Major architectural migration from PM2 to native Bun process management,
and better-sqlite3 to bun:sqlite database driver.

Key changes:
- Replace PM2 with custom Bun-based ProcessManager
- Migrate from better-sqlite3 npm to bun:sqlite runtime
- Auto-install Bun and uv (Python) on first run
- Automatic legacy PM2 process cleanup on all platforms
- Complete documentation in docs/PM2-TO-BUN-MIGRATION.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tests/happy-paths/context-injection.test.ts

@@ -6,9 +6,10 @@
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { sampleObservation, featureObservation } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Context Injection (SessionStart)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
   const PROJECT_NAME = 'claude-mem';
 
   beforeEach(() => {

tests/happy-paths/observation-capture.test.ts

@@ -14,9 +14,10 @@ import {
   grepScenario,
   sessionScenario
 } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Observation Capture (PostToolUse)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
 
   beforeEach(() => {
     vi.clearAllMocks();

tests/happy-paths/search.test.ts

@@ -6,9 +6,10 @@
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { sampleObservation, featureObservation } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Search (MCP Tools)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
 
   beforeEach(() => {
     vi.clearAllMocks();

tests/happy-paths/session-cleanup.test.ts

@@ -6,9 +6,10 @@
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { sessionScenario } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Session Cleanup (SessionEnd)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
 
   beforeEach(() => {
     vi.clearAllMocks();

tests/happy-paths/session-init.test.ts

@@ -6,9 +6,10 @@
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { bashCommandScenario, sessionScenario } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Session Initialization (UserPromptSubmit)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
 
   beforeEach(() => {
     vi.clearAllMocks();

tests/happy-paths/session-summary.test.ts

@@ -6,9 +6,10 @@
  */
 import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { sessionSummaryScenario, sessionScenario } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Session Summary (Stop)', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
 
   beforeEach(() => {
     vi.clearAllMocks();

tests/integration/full-lifecycle.test.ts

@@ -11,9 +11,10 @@ import {
   sessionScenario,
   sampleObservation
 } from '../helpers/scenarios.js';
+import { getWorkerPort } from '../../src/shared/worker-utils.js';
 
 describe('Full Observation Lifecycle', () => {
-  const WORKER_PORT = 37777;
+  const WORKER_PORT = getWorkerPort();
   let sessionId: string;
 
   beforeEach(() => {