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

src/agent-runner.ts

@@ -152,12 +152,12 @@ export async function runAgentProcess(
   if (!fs.existsSync(distEntry)) {
     logger.error(
       { runnerDir, chatJid: input.chatJid, runId: input.runId },
-      'Runner not built. Run: cd runners/agent-runner && npm install && npm run build',
+      'Runner not built. Run: cd runners/agent-runner && bun install && bun run build',
     );
     return {
       status: 'error',
       result: null,
-      error: `Runner not built at ${distEntry}. Run npm run build:runners first.`,
+      error: `Runner not built at ${distEntry}. Run bun run build:runners first.`,
     };
   }
 

src/db.ts

@@ -2271,9 +2271,7 @@ export function claimServiceHandoff(id: number): boolean {
        WHERE id = ?
          AND status = 'pending'`,
   ).run(id);
-  return (
-    (db.prepare('SELECT changes() as c').get() as { c: number }).c > 0
-  );
+  return (db.prepare('SELECT changes() as c').get() as { c: number }).c > 0;
 }
 
 export function completeServiceHandoff(id: number): void {

src/restart-context-cli.ts

@@ -5,7 +5,7 @@ function printUsageAndExit(): never {
   console.error(
     [
       'Usage:',
-      '  tsx src/restart-context-cli.ts write --chat-jid <jid> --summary <text> [--verify <text> ...] [--service-id <id> ...]',
+      '  bun src/restart-context-cli.ts write --chat-jid <jid> --summary <text> [--verify <text> ...] [--service-id <id> ...]',
     ].join('\n'),
   );
   process.exit(1);