chore: replace all node/npm/tsx references with bun across codebase

- Source: setup/service.ts, runners.ts, agent-runner.ts error messages
- Scripts: restart-stack.sh, run-migrations.ts → bun
- Bootstrap: setup.sh check_node→check_bun, npm install→bun install
- Docs: CLAUDE.md, README.md, all SKILL.md files
- Tests: service.test.ts, restart-stack.test.ts expectations updated

setup/index.ts

@@ -1,6 +1,6 @@
 /**
  * Setup CLI entry point.
- * Usage: npx tsx setup/index.ts --step <name> [args...]
+ * Usage: bun setup/index.ts --step <name> [args...]
  */
 import { logger } from '../src/logger.js';
 import { emitStatus } from './status.js';
@@ -23,7 +23,7 @@ async function main(): Promise<void> {
 
   if (stepIdx === -1 || !args[stepIdx + 1]) {
     console.error(
-      `Usage: npx tsx setup/index.ts --step <${Object.keys(STEPS).join('|')}> [args...]`,
+      `Usage: bun setup/index.ts --step <${Object.keys(STEPS).join('|')}> [args...]`,
     );
     process.exit(1);
   }

setup/restart-stack.test.ts

@@ -155,7 +155,7 @@ describe('restartStackServices', () => {
         serviceManager: 'systemd',
         serviceId: 'codex-main',
       }),
-    ).toThrow('Run `npm run setup -- --step service`');
+    ).toThrow('Run `bun run setup -- --step service`');
   });
 
   it('does not hide a general start failure behind direct fallback', () => {

setup/restart-stack.ts

@@ -9,7 +9,7 @@ export const STACK_RESTART_UNIT_NAME = 'ejclaw-stack-restart.service';
 const UNIT_NOT_FOUND_PATTERN =
   /(Unit .* not found|Could not find the requested service|not-found)/i;
 const MANAGED_SERVICE_CALLER_FALLBACK_MESSAGE =
-  'Stack restart unit is not installed yet. Run `npm run setup -- --step service` from an external shell before retrying from a managed EJClaw service.';
+  'Stack restart unit is not installed yet. Run `bun run setup -- --step service` from an external shell before retrying from a managed EJClaw service.';
 
 interface RestartStackDeps {
   execFileSyncImpl?: typeof execFileSync;

setup/runners.ts

@@ -15,7 +15,7 @@ export async function run(_args: string[]): Promise<void> {
   let buildOk = false;
   logger.info('Building agent runners');
   try {
-    execSync('npm run build:runners', {
+    execSync('bun run build:runners', {
       cwd: projectRoot,
       stdio: ['ignore', 'pipe', 'pipe'],
     });

setup/service.test.ts

@@ -149,13 +149,13 @@ describe('systemd unit generation', () => {
 
   it('sets correct ExecStart', () => {
     const unit = generateSystemdUnit(
-      '/usr/bin/node',
+      '/usr/bin/bun',
       '/srv/ejclaw',
       '/home/user',
       false,
     );
     expect(unit).toContain(
-      'ExecStart=/usr/bin/node /srv/ejclaw/dist/index.js',
+      'ExecStart=/usr/bin/bun /srv/ejclaw/dist/index.js',
     );
   });
 });
@@ -207,7 +207,7 @@ describe('service definitions', () => {
   it('generates a oneshot stack restart unit', () => {
     const unit = buildStackRestartSystemdUnit(
       '/srv/ejclaw',
-      '/usr/bin/node',
+      '/usr/bin/bun',
       '/home/user',
     );
 

setup/service.ts

@@ -38,7 +38,7 @@ export async function run(_args: string[]): Promise<void> {
   // Build first
   logger.info('Building TypeScript');
   try {
-    execSync('npm run build', {
+    execSync('bun run build', {
       cwd: projectRoot,
       stdio: ['ignore', 'pipe', 'pipe'],
     });