fix(cli): catch unhandled promise rejections in self-contained CLIs (#203)

The freehire and linkedin CLIs called main().then(code => process.exit(code)) with no .catch(). If main() throws or returns a rejected promise, the .then() never runs, process.exit() is never called, and the runtime terminates with exit code 0 - a runtime failure becomes indistinguishable from success (and would suppress the Step 1c WebSearch fallback, which keys on non-zero exit). Adds a .catch() that writes the same JSON error shape the rest of each file already uses ({error, code: INTERNAL_ERROR} to stderr) and exits 1. Scoped to the two self-contained CLIs only; the bunli portals catch internally via defineCommand.

By @oscarbol09.

.agents/skills/linkedin-search/cli/src/cli.ts

@@ -139,4 +139,14 @@ async function main(): Promise<number> {
   return 1
 }
 
-main().then((code) => process.exit(code))
+main()
+  .then((code) => process.exit(code))
+  .catch((e) => {
+    process.stderr.write(
+      JSON.stringify({
+        error: e instanceof Error ? e.message : String(e),
+        code: "INTERNAL_ERROR",
+      }) + "\n",
+    )
+    process.exit(1)
+  })