feat(migration): implement workspace layout migration and testing

- Added `migrate-layout.ts` to handle migration from old workspace layouts to the new `devclaw/` structure.
- Introduced `migrate-layout.test.ts` for comprehensive tests covering various migration scenarios.
- Updated `workspace.ts` to ensure default files are created post-migration, including `workflow.yaml` and role-specific prompts.
- Refactored role instruction handling to accommodate new directory structure.
- Enhanced project registration to scaffold prompt files in the new `devclaw/projects/<project>/prompts/` directory.
- Adjusted setup tool descriptions and logic to reflect changes in file structure.
- Updated templates to align with the new workflow configuration and role instructions.

lib/tools/onboard.ts

@@ -26,7 +26,7 @@ export function createOnboardTool(api: OpenClawPluginApi) {
       const mode = params.mode ? (params.mode as "first-run" | "reconfigure")
         : configured && hasWorkspace ? "reconfigure" : "first-run";
 
-      const instructions = mode === "first-run" ? buildOnboardToolContext() : buildReconfigContext(api.pluginConfig as Record<string, unknown>);
+      const instructions = mode === "first-run" ? buildOnboardToolContext() : buildReconfigContext();
 
       return jsonResult({
         success: true, mode, configured, instructions,