hardening: isolate third-party paths and clean external-build metadata (#311)

* hardening: isolate third-party paths and clean external-build metadata

* fix: restore external feedback flow and make privacy check portable

scripts/verify-no-phone-home.ts

@@ -0,0 +1,43 @@
+import { existsSync, readFileSync } from 'node:fs'
+
+const DIST = 'dist/cli.mjs'
+const BANNED_PATTERNS = [
+  'datadoghq.com',
+  'api/event_logging/batch',
+  'api/claude_code/metrics',
+  'getKubernetesNamespace',
+  '/var/run/secrets/kubernetes',
+  '/proc/self/mountinfo',
+  'tengu_internal_record_permission_context',
+] as const
+
+if (!existsSync(DIST)) {
+  console.error(`ERROR: ${DIST} not found. Run 'bun run build' first.`)
+  process.exit(1)
+}
+
+const contents = readFileSync(DIST, 'utf8')
+let exitCode = 0
+
+console.log(`Checking ${DIST} for banned patterns...`)
+console.log('')
+
+for (const pattern of BANNED_PATTERNS) {
+  const count = contents.split(pattern).length - 1
+  if (count > 0) {
+    console.log(`  FAIL: '${pattern}' found (${count} occurrences)`)
+    exitCode = 1
+  } else {
+    console.log(`  PASS: '${pattern}' not found`)
+  }
+}
+
+console.log('')
+
+if (exitCode === 0) {
+  console.log('✓ All checks passed — no banned patterns in build output')
+} else {
+  console.log('✗ FAILED — banned patterns found in build output')
+}
+
+process.exit(exitCode)