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/project-register.ts

@@ -16,18 +16,19 @@ import { createProvider } from "../providers/index.js";
 import { log as auditLog } from "../audit.js";
 import { getAllRoleIds, getLevelsForRole } from "../roles/index.js";
 import { DEFAULT_ROLE_INSTRUCTIONS } from "../templates.js";
+import { DATA_DIR } from "../setup/migrate-layout.js";
 
 /**
  * Scaffold project-specific prompt files for all registered roles.
  * Returns true if files were created, false if they already existed.
  */
 async function scaffoldPromptFiles(workspaceDir: string, projectName: string): Promise<boolean> {
-  const projectDir = path.join(workspaceDir, "projects", "roles", projectName);
-  await fs.mkdir(projectDir, { recursive: true });
+  const promptsDir = path.join(workspaceDir, DATA_DIR, "projects", projectName, "prompts");
+  await fs.mkdir(promptsDir, { recursive: true });
 
   let created = false;
   for (const role of getAllRoleIds()) {
-    const filePath = path.join(projectDir, `${role}.md`);
+    const filePath = path.join(promptsDir, `${role}.md`);
     try {
       await fs.access(filePath);
     } catch {