fix(typescript-service-release): notify only on major (breaking) releases

The notify job fired on every real release (major | minor | patch). Per
intent, release emails should only go out for breaking changes, so gate
the job on release_type == 'major'. Minor/patch releases now skip the
notify job cleanly. Updates the notify-on-release input description to
match.

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

Author: yanxue06

.github/workflows/typescript-service-release.yaml

@@ -71,7 +71,7 @@ on:
         type: boolean
         required: false
         default: true
-        description: "Fire the post-release notify job on real releases (major | minor | patch). Callers not on the in-job allow-list skip cleanly. Set to false to opt a specific release out."
+        description: "Fire the post-release notify job on major (breaking) releases only. Minor/patch releases and callers not on the in-job allow-list skip cleanly. Set to false to opt a specific release out."
     secrets:
       OPENAI_API_KEY:
         required: true
@@ -233,7 +233,7 @@ jobs:
       (needs.npm-publish.result == 'success' || needs.npm-publish.result == 'skipped') &&
       (needs.npm-publish-oidc.result == 'success' || needs.npm-publish-oidc.result == 'skipped') &&
       inputs.notify-on-release &&
-      contains(fromJSON('["major","minor","patch"]'), needs.release-info.outputs.release_type)
+      needs.release-info.outputs.release_type == 'major'
     runs-on: ${{ inputs.use-blacksmith && 'blacksmith-4vcpu-ubuntu-2404' || 'ubuntu-latest' }}
     permissions:
       contents: read