ci: fix @claude mention workflow never triggering

The Claude Code workflow has never executed: every run in its history
was skipped by the job gate, including a reply that met every stated
condition (gf712 actor, review-comment event, @claude in the body).
The only difference from the official claude-code-action template is
the hand-added github.actor wrapper around the condition, so drop it
and use the template condition verbatim; the action's built-in check
already restricts triggers to users with write access. Also subscribe
to the issue_comment and issues events that the condition always
handled but the trigger list never delivered, so @claude works from
the PR conversation tab and issues too.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017NJ25FGK2EUWCLz2PaUwbT

Author: gf712

.github/workflows/claude.yml

@@ -1,20 +1,24 @@
 name: Claude Code
 
 on:
+  issue_comment:
+    types: [created]
   pull_request_review_comment:
     types: [created]
+  issues:
+    types: [opened]
   pull_request_review:
     types: [submitted]
 
 jobs:
   claude:
+    # No actor gate needed: claude-code-action only responds to users with
+    # write access to the repository.
     if: |
-      github.actor == 'gf712' && (
-        (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.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
     permissions:
       contents: read