refactor: require Bun globally, add auto-install, remove Windows executable approach (#243)

- Delete BinaryManager.ts - no longer needed
- Simplify ProcessManager.ts - single Bun spawn path for all platforms
- Update smart-install.js - auto-install Bun if missing (Windows/Unix)
- Update documentation to reflect Bun requirement

This simplifies the codebase by:
- Using Bun consistently across all platforms (hooks + worker)
- Eliminating binary download/hosting complexity
- Zero native dependencies with bun:sqlite
- Auto-installing Bun on first run if not present

Co-authored-by: Claude <noreply@anthropic.com>

CLAUDE.md

@@ -76,8 +76,8 @@ Settings are managed in `~/.claude-mem/settings.json`. The file is auto-created
 
 ## Requirements
 
-- **Bun** >= 1.0 (Mac/Linux runtime)
-- Node.js >= 18 (build tools)
+- **Bun** >= 1.0 (all platforms - auto-installed if missing)
+- Node.js >= 18 (build tools only)
 
 ## Quick Reference
 

README.md

@@ -108,7 +108,7 @@ npx mintlify dev
 - **[Architecture Evolution](https://docs.claude-mem.ai/architecture-evolution)** - The journey from v3 to v5
 - **[Hooks Architecture](https://docs.claude-mem.ai/hooks-architecture)** - How Claude-Mem uses lifecycle hooks
 - **[Hooks Reference](https://docs.claude-mem.ai/architecture/hooks)** - 7 hook scripts explained
-- **[Worker Service](https://docs.claude-mem.ai/architecture/worker-service)** - HTTP API & PM2 management
+- **[Worker Service](https://docs.claude-mem.ai/architecture/worker-service)** - HTTP API & Bun process management
 - **[Database](https://docs.claude-mem.ai/architecture/database)** - SQLite schema & FTS5 search
 - **[Search Architecture](https://docs.claude-mem.ai/architecture/search-architecture)** - Hybrid search with Chroma vector database
 
@@ -148,7 +148,7 @@ npx mintlify dev
 
 1. **5 Lifecycle Hooks** - SessionStart, UserPromptSubmit, PostToolUse, Stop, SessionEnd (6 hook scripts)
 2. **Smart Install** - Cached dependency checker (pre-hook script, not a lifecycle hook)
-3. **Worker Service** - HTTP API on port 37777 with web viewer UI and 10 search endpoints, managed by PM2
+3. **Worker Service** - HTTP API on port 37777 with web viewer UI and 10 search endpoints, managed by Bun
 4. **SQLite Database** - Stores sessions, observations, summaries with FTS5 full-text search
 5. **mem-search Skill** - Natural language queries with progressive disclosure (~2,250 token savings vs MCP)
 6. **Chroma Vector Database** - Hybrid semantic + keyword search for intelligent context retrieval
@@ -260,10 +260,10 @@ See [CHANGELOG.md](CHANGELOG.md) for complete version history.
 
 ## System Requirements
 
-- **Node.js**: 18.0.0 or higher
+- **Bun**: 1.0 or higher (auto-installed on first run if missing)
+- **Node.js**: 18.0.0 or higher (for build tools)
 - **Claude Code**: Latest version with plugin support
-- **PM2**: Process manager (bundled - no global install required)
-- **SQLite 3**: For persistent storage (bundled)
+- **SQLite 3**: For persistent storage (via bun:sqlite - zero native dependencies)
 
 ---
 

docs/public/architecture/worker-service.mdx

@@ -1,16 +1,17 @@
 ---
 title: "Worker Service"
-description: "HTTP API and PM2 process management"
+description: "HTTP API and Bun process management"
 ---
 
 # Worker Service
 
-The worker service is a long-running HTTP API built with Express.js and managed by PM2. It processes observations through the Claude Agent SDK separately from hook execution to prevent timeout issues.
+The worker service is a long-running HTTP API built with Express.js and managed natively by Bun. It processes observations through the Claude Agent SDK separately from hook execution to prevent timeout issues.
 
 ## Overview
 
 - **Technology**: Express.js HTTP server
-- **Process Manager**: PM2
+- **Runtime**: Bun (auto-installed if missing)
+- **Process Manager**: Native Bun process management via ProcessManager
 - **Port**: Fixed port 37777 (configurable via `CLAUDE_MEM_WORKER_PORT`)
 - **Location**: `src/services/worker-service.ts`
 - **Built Output**: `plugin/scripts/worker-service.cjs`
@@ -322,28 +323,15 @@ DELETE /sessions/:sessionDbId
 
 **Note**: As of v4.1.0, the cleanup hook no longer calls this endpoint. Sessions are marked complete instead of deleted to allow graceful worker shutdown.
 
-## PM2 Management
+## Bun Process Management
 
-### Configuration
+### Overview
 
-The worker is configured via `ecosystem.config.cjs`:
-
-```javascript
-module.exports = {
-  apps: [{
-    name: 'claude-mem-worker',
-    script: './plugin/scripts/worker-service.cjs',
-    instances: 1,
-    autorestart: true,
-    watch: false,
-    max_memory_restart: '1G',
-    env: {
-      NODE_ENV: 'production',
-      FORCE_COLOR: '1'
-    }
-  }]
-};
-```
+The worker is managed by the native `ProcessManager` class which handles:
+- Process spawning with Bun runtime
+- PID file tracking at `~/.claude-mem/worker.pid`
+- Health checks with automatic retry
+- Graceful shutdown with SIGTERM/SIGKILL fallback
 
 ### Commands
 
@@ -366,7 +354,18 @@ npm run worker:status
 
 ### Auto-Start Behavior
 
-As of v4.0.0, the worker service auto-starts when the SessionStart hook fires. Manual start is optional.
+The worker service auto-starts when the SessionStart hook fires. Manual start is optional.
+
+### Bun Requirement
+
+Bun is required to run the worker service. If Bun is not installed, the smart-install script will automatically install it on first run:
+
+- **Windows**: `powershell -c "irm bun.sh/install.ps1 | iex"`
+- **macOS/Linux**: `curl -fsSL https://bun.sh/install | bash`
+
+You can also install manually via:
+- `winget install Oven-sh.Bun` (Windows)
+- `brew install oven-sh/bun/bun` (macOS)
 
 ## Claude Agent SDK Integration
 
@@ -410,15 +409,15 @@ If port 37777 is in use, the worker will fail to start. Set a custom port via en
 
 ## Data Storage
 
-The worker service stores data in the plugin data directory:
+The worker service stores data in the user data directory:
 
 ```
-${CLAUDE_PLUGIN_ROOT}/data/
-├── claude-mem.db           # SQLite database
-├── worker.port             # Current worker port file
+~/.claude-mem/
+├── claude-mem.db           # SQLite database (bun:sqlite)
+├── worker.pid              # PID file for process tracking
+├── settings.json           # User settings
 └── logs/
-    ├── worker-out.log      # Worker stdout logs
-    └── worker-error.log    # Worker stderr logs
+    └── worker-YYYY-MM-DD.log  # Daily rotating logs
 ```
 
 ## Error Handling

scripts/smart-install.js

@@ -1,40 +1,171 @@
 #!/usr/bin/env node
+/**
+ * Smart Install Script for claude-mem
+ *
+ * Ensures Bun runtime is installed (auto-installs if missing)
+ * and handles dependency installation when needed.
+ */
 import { existsSync, readFileSync, writeFileSync } from 'fs';
-import { execSync } from 'child_process';
+import { execSync, spawnSync } from 'child_process';
 import { join } from 'path';
 import { homedir } from 'os';
 
 const ROOT = join(homedir(), '.claude', 'plugins', 'marketplaces', 'thedotmack');
 const MARKER = join(ROOT, '.install-version');
+const IS_WINDOWS = process.platform === 'win32';
 
+/**
+ * Check if Bun is installed and accessible
+ */
+function isBunInstalled() {
+  try {
+    const result = spawnSync('bun', ['--version'], {
+      encoding: 'utf-8',
+      stdio: ['pipe', 'pipe', 'pipe'],
+      shell: IS_WINDOWS
+    });
+    return result.status === 0;
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Get Bun version if installed
+ */
+function getBunVersion() {
+  try {
+    const result = spawnSync('bun', ['--version'], {
+      encoding: 'utf-8',
+      stdio: ['pipe', 'pipe', 'pipe'],
+      shell: IS_WINDOWS
+    });
+    return result.status === 0 ? result.stdout.trim() : null;
+  } catch {
+    return null;
+  }
+}
+
+/**
+ * Install Bun automatically based on platform
+ */
+function installBun() {
+  console.error('🔧 Bun not found. Installing Bun runtime...');
+
+  try {
+    if (IS_WINDOWS) {
+      // Windows: Use PowerShell installer
+      console.error('   Installing via PowerShell...');
+      execSync('powershell -c "irm bun.sh/install.ps1 | iex"', {
+        stdio: 'inherit',
+        shell: true
+      });
+    } else {
+      // Unix/macOS: Use curl installer
+      console.error('   Installing via curl...');
+      execSync('curl -fsSL https://bun.sh/install | bash', {
+        stdio: 'inherit',
+        shell: true
+      });
+    }
+
+    // Verify installation
+    if (isBunInstalled()) {
+      const version = getBunVersion();
+      console.error(`✅ Bun ${version} installed successfully`);
+      return true;
+    } else {
+      // Bun may be installed but not in PATH yet for this session
+      // Try common installation paths
+      const bunPaths = IS_WINDOWS
+        ? [join(homedir(), '.bun', 'bin', 'bun.exe')]
+        : [join(homedir(), '.bun', 'bin', 'bun'), '/usr/local/bin/bun'];
+
+      for (const bunPath of bunPaths) {
+        if (existsSync(bunPath)) {
+          console.error(`✅ Bun installed at ${bunPath}`);
+          console.error('⚠️  Please restart your terminal or add Bun to PATH:');
+          if (IS_WINDOWS) {
+            console.error(`   $env:Path += ";${join(homedir(), '.bun', 'bin')}"`);
+          } else {
+            console.error(`   export PATH="$HOME/.bun/bin:$PATH"`);
+          }
+          return true;
+        }
+      }
+
+      throw new Error('Bun installation completed but binary not found');
+    }
+  } catch (error) {
+    console.error('❌ Failed to install Bun automatically');
+    console.error('   Please install manually:');
+    if (IS_WINDOWS) {
+      console.error('   - winget install Oven-sh.Bun');
+      console.error('   - Or: powershell -c "irm bun.sh/install.ps1 | iex"');
+    } else {
+      console.error('   - curl -fsSL https://bun.sh/install | bash');
+      console.error('   - Or: brew install oven-sh/bun/bun');
+    }
+    console.error('   Then restart your terminal and try again.');
+    throw error;
+  }
+}
+
+/**
+ * Check if dependencies need to be installed
+ */
 function needsInstall() {
   if (!existsSync(join(ROOT, 'node_modules'))) return true;
   try {
     const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf-8'));
     const marker = JSON.parse(readFileSync(MARKER, 'utf-8'));
-    return pkg.version !== marker.version || process.version !== marker.node;
+    return pkg.version !== marker.version || getBunVersion() !== marker.bun;
   } catch {
     return true;
   }
 }
 
-function install() {
-  console.error('Installing dependencies...');
+/**
+ * Install dependencies using Bun
+ */
+function installDeps() {
+  console.error('📦 Installing dependencies with Bun...');
   try {
-    execSync('npm install', { cwd: ROOT, stdio: 'inherit' });
+    execSync('bun install', { cwd: ROOT, stdio: 'inherit', shell: IS_WINDOWS });
   } catch {
-    execSync('npm install --force', { cwd: ROOT, stdio: 'inherit' });
+    // Retry with force flag
+    execSync('bun install --force', { cwd: ROOT, stdio: 'inherit', shell: IS_WINDOWS });
   }
+
+  // Write version marker
   const pkg = JSON.parse(readFileSync(join(ROOT, 'package.json'), 'utf-8'));
-  writeFileSync(MARKER, JSON.stringify({ version: pkg.version, node: process.version }));
+  writeFileSync(MARKER, JSON.stringify({
+    version: pkg.version,
+    bun: getBunVersion(),
+    installedAt: new Date().toISOString()
+  }));
 }
 
-if (needsInstall()) {
-  try {
-    install();
-    console.error('✅ Dependencies installed');
-  } catch (e) {
-    console.error('❌ npm install failed:', e.message);
-    process.exit(1);
+// Main execution
+try {
+  // Step 1: Ensure Bun is installed
+  if (!isBunInstalled()) {
+    installBun();
+
+    // Re-check after installation
+    if (!isBunInstalled()) {
+      console.error('❌ Bun is required but not available in PATH');
+      console.error('   Please restart your terminal after installation');
+      process.exit(1);
+    }
   }
+
+  // Step 2: Install dependencies if needed
+  if (needsInstall()) {
+    installDeps();
+    console.error('✅ Dependencies installed');
+  }
+} catch (e) {
+  console.error('❌ Installation failed:', e.message);
+  process.exit(1);
 }

src/services/process/BinaryManager.ts

@@ -1,76 +0,0 @@
-import { existsSync, mkdirSync, writeFileSync, readFileSync } from 'fs';
-import { join } from 'path';
-import { DATA_DIR } from '../../shared/paths.js';
-
-const BIN_DIR = join(DATA_DIR, 'bin');
-const VERSION_FILE = join(BIN_DIR, 'version.txt');
-const GITHUB_RELEASES = 'https://github.com/thedotmack/claude-mem/releases/download';
-
-export class BinaryManager {
-  static async getExecutablePath(): Promise<string> {
-    if (process.platform !== 'win32') {
-      throw new Error('BinaryManager only used on Windows');
-    }
-
-    const version = this.getCurrentVersion();
-    const binaryPath = join(BIN_DIR, 'worker-service.exe');
-
-    // Check if we have correct version
-    if (existsSync(binaryPath)) {
-      const installed = this.getInstalledVersion();
-      if (installed === version) return binaryPath;
-    }
-
-    // Download
-    await this.downloadBinary(version);
-    return binaryPath;
-  }
-
-  private static async downloadBinary(version: string): Promise<void> {
-    const url = `${GITHUB_RELEASES}/v${version}/worker-service-v${version}-win-x64.exe`;
-    console.log(`Downloading worker binary v${version}...`);
-
-    const response = await fetch(url);
-    if (!response.ok) {
-      throw new Error(
-        `Download failed: ${response.status}\n` +
-        `URL: ${url}\n` +
-        `Make sure the release exists with a Windows binary attached.`
-      );
-    }
-
-    const buffer = await response.arrayBuffer();
-    mkdirSync(BIN_DIR, { recursive: true });
-
-    const binaryPath = join(BIN_DIR, 'worker-service.exe');
-    writeFileSync(binaryPath, Buffer.from(buffer));
-
-    // Write version file
-    writeFileSync(VERSION_FILE, version);
-
-    console.log('Download complete');
-  }
-
-  private static getCurrentVersion(): string {
-    // Read from package.json in the installed plugin location
-    // This ensures we get the correct version even when running from marketplace
-    try {
-      const packageJson = JSON.parse(
-        readFileSync(join(DATA_DIR, '..', '.claude', 'plugins', 'marketplaces', 'thedotmack', 'package.json'), 'utf-8')
-      );
-      return packageJson.version;
-    } catch {
-      // Fallback to environment variable
-      return process.env.npm_package_version || 'unknown';
-    }
-  }
-
-  private static getInstalledVersion(): string | null {
-    try {
-      if (!existsSync(VERSION_FILE)) return null;
-      return readFileSync(VERSION_FILE, 'utf-8').trim();
-    } catch {
-      return null;
-    }
-  }
-}

src/services/process/ProcessManager.ts

@@ -43,21 +43,21 @@ export class ProcessManager {
 
     const logFile = this.getLogFilePath();
 
-    // Platform-specific spawn
-    if (process.platform === 'win32') {
-      return this.startWindows(port);
-    } else {
-      return this.startUnix(workerScript, logFile, port);
-    }
+    // Use Bun on all platforms
+    return this.startWithBun(workerScript, logFile, port);
   }
 
-  private static async startUnix(script: string, logFile: string, port: number): Promise<{ success: boolean; pid?: number; error?: string }> {
+  private static async startWithBun(script: string, logFile: string, port: number): Promise<{ success: boolean; pid?: number; error?: string }> {
     try {
+      const isWindows = process.platform === 'win32';
+
       const child = spawn('bun', [script], {
         detached: true,
         stdio: ['ignore', 'pipe', 'pipe'],
         env: { ...process.env, CLAUDE_MEM_WORKER_PORT: String(port) },
-        cwd: MARKETPLACE_ROOT
+        cwd: MARKETPLACE_ROOT,
+        // Hide console window on Windows
+        ...(isWindows && { windowsHide: true })
       });
 
       // Write logs
@@ -89,48 +89,6 @@ export class ProcessManager {
     }
   }
 
-  private static async startWindows(port: number): Promise<{ success: boolean; pid?: number; error?: string }> {
-    // Windows: Use compiled exe from ~/.claude-mem/bin/
-    // Import dynamically to avoid loading on non-Windows platforms
-    const { BinaryManager } = await import('./BinaryManager.js');
-
-    try {
-      const exePath = await BinaryManager.getExecutablePath();
-
-      const child = spawn(exePath, [], {
-        detached: true,
-        stdio: ['ignore', 'pipe', 'pipe'],
-        env: { ...process.env, CLAUDE_MEM_WORKER_PORT: String(port) },
-        windowsHide: true
-      });
-
-      const logFile = this.getLogFilePath();
-      const logStream = createWriteStream(logFile, { flags: 'a' });
-      child.stdout?.pipe(logStream);
-      child.stderr?.pipe(logStream);
-
-      child.unref();
-
-      if (!child.pid) {
-        return { success: false, error: 'Failed to get PID from spawned process' };
-      }
-
-      this.writePidFile({
-        pid: child.pid,
-        port,
-        startedAt: new Date().toISOString(),
-        version: process.env.npm_package_version || 'unknown'
-      });
-
-      return this.waitForHealth(child.pid, port);
-    } catch (error) {
-      return {
-        success: false,
-        error: error instanceof Error ? error.message : String(error)
-      };
-    }
-  }
-
   static async stop(timeout: number = PROCESS_STOP_TIMEOUT_MS): Promise<boolean> {
     const info = this.getPidInfo();
     if (!info) return true;