feat: add Claude Code GitHub Action for automated bug fixing

Adds a workflow that triggers Claude to analyze and fix bugs automatically
when issues are opened with the 'bug' label, and responds to @claude
mentions on issues and PRs.

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

Author: Fato07

.github/workflows/claude.yml

@@ -0,0 +1,37 @@
+name: Claude Code
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened]
+
+jobs:
+  claude:
+    # Only run on @claude mentions OR bug-labeled issues
+    if: |
+      (github.event_name == 'issues' && contains(github.event.issue.labels.*.name, 'bug')) ||
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude'))
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+      issues: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.23'
+
+      - uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          # For auto-triggered bug issues, provide explicit instructions
+          prompt: |
+            ${{ github.event_name == 'issues' && 'Analyze this bug report. Read the full codebase to understand the architecture. Fix the bug, run `go build ./...` and `go test ./...` to verify no regressions, then create a PR with the fix.' || '' }}

CLAUDE.md

@@ -32,4 +32,15 @@ Go 1.22: Follow standard conventions
 - 001-agit-architecture-impl: Added Go 1.22 + `github.com/mark3labs/mcp-go` v0.20.1 (MCP protocol), `github.com/spf13/cobra` v1.8.1 (CLI), `modernc.org/sqlite` v1.34.4 (database)
 
 <!-- MANUAL ADDITIONS START -->
+
+## CI Verification
+
+When fixing bugs or implementing features, always run:
+```bash
+go build ./...
+go test ./... -race
+golangci-lint run
+```
+All three must pass before creating a PR.
+
 <!-- MANUAL ADDITIONS END -->