recruiter-responder: bump image_tag to 94b37a9c (follow-up detection)

Replies from recruiters to our sent decline / engage / ignored threads
are now attached to the existing thread, surface with a 🔁 follow-up
marker in Telegram ("you previously sent"), and re-open thread status
to pending so they show up in recruiter_list status=pending.

Smoke-tested live: Rachel-style follow-up referencing our outbound
msgid + the original recruiter msgid in References → correctly
attached to thread #87, status flipped sent→pending, 3 messages
persisted (in/out/in).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

stacks/recruiter-responder/terragrunt.hcl

@@ -19,5 +19,5 @@ dependency "external-secrets" {
 
 inputs = {
   # Override per-deploy in CI / commit.
-  image_tag = "02a01c9a"
+  image_tag = "94b37a9c"
 }