Add Claude Code GitHub Workflow (#118)

* "Claude PR Assistant workflow"

* fix: harden Claude Code workflow — pin SHA, restrict to trusted actors

- Pin anthropics/claude-code-action to immutable commit SHA (094bd24)
- Restrict triggers to repo owner, members, and collaborators via
  author_association checks on each event type
- Remove trailing blank line, clean up inline comments
- Remove unused optional comments for cleaner config

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: add 30-minute timeout to Claude Code workflow

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: michaelmcnees

.github/workflows/claude.yml

@@ -0,0 +1,44 @@
+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned]
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  claude:
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude') &&
+        (github.event.comment.user.login == github.repository_owner || github.event.comment.author_association == 'OWNER' || github.event.comment.author_association == 'MEMBER' || github.event.comment.author_association == 'COLLABORATOR')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude') &&
+        (github.event.comment.user.login == github.repository_owner || github.event.comment.author_association == 'OWNER' || github.event.comment.author_association == 'MEMBER' || github.event.comment.author_association == 'COLLABORATOR')) ||
+      (github.event_name == 'pull_request_review' && contains(github.event.review.body, '@claude') &&
+        (github.event.review.user.login == github.repository_owner || github.event.review.author_association == 'OWNER' || github.event.review.author_association == 'MEMBER' || github.event.review.author_association == 'COLLABORATOR')) ||
+      (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')) &&
+        (github.event.issue.user.login == github.repository_owner || github.event.issue.author_association == 'OWNER' || github.event.issue.author_association == 'MEMBER' || github.event.issue.author_association == 'COLLABORATOR'))
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    permissions:
+      contents: read
+      pull-requests: read
+      issues: read
+      id-token: write
+      actions: read
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: anthropics/claude-code-action@094bd24d575e7b30ac1576024817bf1a97c81262 # v1
+        with:
+          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          additional_permissions: |
+            actions: read