Add Cleanup Extension to catalog

**Repository**: https://github.com/dsrednicki/spec-kit-cleanup
**Version**: 1.0.0
**License**: MIT
**Author**: @dsrednicki

### What it does

Post-implementation quality gate that reviews changes and handles issues by severity:

| Severity | Action |
|----------|--------|
| SMALL | Fix immediately (Scout Rule) - debug statements, unused imports |
| MEDIUM | Create follow-up tasks in tasks.md |
| LARGE | Generate tech-debt-report.md with analysis and options |
| CRITICAL | Halt and alert (security issues) |

### Command

| Command | Description |
|---------|-------------|
| `/speckit.cleanup.run` | Review implementation, fix small issues, identify tech debt |
| `/speckit.cleanup` | Alias for above |

### Hook

- `after_implement` - Prompts to run cleanup after `/speckit.implement`

### Installation (once merged)

```bash
specify extension add cleanup
```

Author: dsrednicki

extensions/catalog.json

@@ -1,6 +1,38 @@
 {
   "schema_version": "1.0",
-  "updated_at": "2026-02-03T00:00:00Z",
+  "updated_at": "2026-02-22T00:00:00Z",
   "catalog_url": "https://raw.githubusercontent.com/github/spec-kit/main/extensions/catalog.json",
-  "extensions": {}
+  "extensions": {
+    "cleanup": {
+      "name": "Cleanup Extension",
+      "id": "cleanup",
+      "description": "Post-implementation quality gate that reviews changes, fixes small issues (scout rule), creates tasks for medium issues, and generates analysis for large issues.",
+      "author": "dsrednicki",
+      "version": "1.0.0",
+      "download_url": "https://github.com/dsrednicki/spec-kit-cleanup/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/dsrednicki/spec-kit-cleanup",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.1.0"
+      },
+      "provides": {
+        "commands": 1,
+        "hooks": 1
+      },
+      "tags": [
+        "quality",
+        "tech-debt",
+        "review",
+        "cleanup",
+        "scout-rule"
+      ],
+      "verified": false,
+      "created_at": "2026-02-22T00:00:00Z",
+      "updated_at": "2026-02-22T00:00:00Z",
+      "statistics": {
+        "downloads": 0,
+        "stars": 0
+      }
+    }
+  }
 }