Add Worktree Isolation extension to community catalog (#2143)

- 3 commands: create, list, clean worktrees for parallel feature development
- 1 hook: after_specify for auto-worktree creation
- Addresses community request in issue #61 (36+ upvotes)

Author: Quratulain-bilal

README.md

@@ -233,6 +233,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | V-Model Extension Pack | Enforces V-Model paired generation of development specs and test specs with full traceability | `docs` | Read+Write | [spec-kit-v-model](https://github.com/leocamello/spec-kit-v-model) |
 | Verify Extension | Post-implementation quality gate that validates implemented code against specification artifacts | `code` | Read-only | [spec-kit-verify](https://github.com/ismaelJimenez/spec-kit-verify) |
 | Verify Tasks Extension | Detect phantom completions: tasks marked [X] in tasks.md with no real implementation | `code` | Read-only | [spec-kit-verify-tasks](https://github.com/datastone-inc/spec-kit-verify-tasks) |
+| Worktree Isolation | Spawn isolated git worktrees for parallel feature development without checkout switching | `process` | Read+Write | [spec-kit-worktree](https://github.com/Quratulain-bilal/spec-kit-worktree) |
 
 To submit your own extension, see the [Extension Publishing Guide](extensions/EXTENSION-PUBLISHING-GUIDE.md).
 

extensions/catalog.community.json

@@ -1653,6 +1653,38 @@
       "stars": 0,
       "created_at": "2026-03-16T00:00:00Z",
       "updated_at": "2026-03-16T00:00:00Z"
+    },
+    "worktree": {
+      "name": "Worktree Isolation",
+      "id": "worktree",
+      "description": "Spawn isolated git worktrees for parallel feature development without checkout switching.",
+      "author": "Quratulain-bilal",
+      "version": "1.0.0",
+      "download_url": "https://github.com/Quratulain-bilal/spec-kit-worktree/archive/refs/tags/v1.0.0.zip",
+      "repository": "https://github.com/Quratulain-bilal/spec-kit-worktree",
+      "homepage": "https://github.com/Quratulain-bilal/spec-kit-worktree",
+      "documentation": "https://github.com/Quratulain-bilal/spec-kit-worktree/blob/main/README.md",
+      "changelog": "https://github.com/Quratulain-bilal/spec-kit-worktree/blob/main/CHANGELOG.md",
+      "license": "MIT",
+      "requires": {
+        "speckit_version": ">=0.4.0"
+      },
+      "provides": {
+        "commands": 3,
+        "hooks": 1
+      },
+      "tags": [
+        "worktree",
+        "git",
+        "parallel",
+        "isolation",
+        "workflow"
+      ],
+      "verified": false,
+      "downloads": 0,
+      "stars": 0,
+      "created_at": "2026-04-09T00:00:00Z",
+      "updated_at": "2026-04-09T00:00:00Z"
     }
   }
 }