feat: add tag mode workflow for Forgejo

Enables @claude mentions on issues, PR review comments,
issue assignment, and label triggers on Forgejo.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.forgejo/workflows/claude.yml

@@ -0,0 +1,61 @@
+name: Claude Code (Forgejo)
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, assigned, labeled]
+  pull_request_review:
+    types: [submitted]
+
+concurrency:
+  group: claude-${{ github.event.issue.number || github.event.pull_request.number }}-${{ github.run_id }}
+
+jobs:
+  claude:
+    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' && (
+        github.event.action == 'labeled' ||
+        github.event.action == 'assigned' ||
+        contains(github.event.issue.body, '@claude') ||
+        contains(github.event.issue.title, '@claude')
+      ))
+    runs-on: grunt
+    steps:
+      - name: Checkout
+        uses: https://${{ secrets.READ_REPO_TOKEN }}@git.wxs.ro/xternal/checkout@v6.0.2
+        with:
+          fetch-depth: 1
+
+      - name: Run Claude Code
+        id: claude
+        uses: ./
+        with:
+          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          github_token: ${{ secrets.FORGEJO_CLAUDE_TOKEN }}
+          platform: "forgejo"
+        env:
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+
+      - name: Debug on failure
+        if: failure()
+        run: |
+          echo "=== Debug Info ==="
+          echo "Platform: PLATFORM=$PLATFORM FORGEJO=$FORGEJO"
+          echo "Server URL: $GITHUB_SERVER_URL"
+          echo "API URL: $GITHUB_API_URL"
+          echo "Event: ${{ github.event_name }} / ${{ github.event.action }}"
+          echo "Actor: ${{ github.actor }}"
+          echo ""
+          EXEC_FILE="${{ steps.claude.outputs.execution_file }}"
+          if [ -f "$EXEC_FILE" ]; then
+            echo "--- Execution file contents ---"
+            cat "$EXEC_FILE"
+          else
+            echo "No execution file found"
+          fi