Restrict @claude mention trigger to a trusted account (#10)

Add an actor check to `claude.yml` so `@claude` mentions only run for
a single trusted account.

Author: jnasbyupgrade

.github/workflows/claude.yml

@@ -14,11 +14,16 @@ on:
 # serializing would only delay responses and cancelling would drop them.
 jobs:
   claude:
+    # SECURITY: restricts @claude to a single trusted account, not just
+    # matching comment text — otherwise anyone could trigger this job.
     if: |
-      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
-      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
-      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
-      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+      github.actor == 'jnasbyupgrade' &&
+      (
+        (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+        (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
+        (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude')) ||
+        (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
+      )
     runs-on: ubuntu-latest
     timeout-minutes: 30
     permissions: