feat(telemetry): add a safe input_format tag to worker error reports (#541)

Every worker tool error now carries an input_format tag (file extension only, never the filename) for triage, derived once at the worker error path and added to the scrubber allowlist.

apps/api/src/lib/sentry-scrub.ts

@@ -22,6 +22,7 @@ const TAG_ALLOWLIST = new Set([
   "deploy_mode",
   "subsystem",
   "status_code",
+  "input_format",
 ]);
 
 const URL_RE = /https?:\/\/[^\s"')]+/g;