docs: specify extension add requires worktrees id before --from

Made-with: Cursor

Author: dango85

PUBLISH.md

@@ -37,5 +37,5 @@ Reference issues: #61, #1476
 ## 3. Install in any repo
 
 ```bash
-specify extension add --from https://github.com/dango85/spec-kit-worktree-parallel/archive/refs/tags/v1.3.0.zip
+specify extension add worktrees --from https://github.com/dango85/spec-kit-worktree-parallel/archive/refs/tags/v1.3.0.zip
 ```

README.md

@@ -19,7 +19,7 @@ This extension **does not** change another extension’s configuration on instal
 ## Installation
 
 ```bash
-specify extension add --from https://github.com/dango85/spec-kit-worktree-parallel/archive/refs/tags/v1.3.0.zip
+specify extension add worktrees --from https://github.com/dango85/spec-kit-worktree-parallel/archive/refs/tags/v1.3.0.zip
 ```
 
 ## Layout modes