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/projects.ts

@@ -6,6 +6,7 @@ import fs from "node:fs/promises";
 import path from "node:path";
 import { homedir } from "node:os";
 import { migrateProject } from "./migrations.js";
+import { ensureWorkspaceMigrated, DATA_DIR } from "./setup/migrate-layout.js";
 
 export type WorkerState = {
   active: boolean;
@@ -66,10 +67,11 @@ export function getSessionForLevel(
 }
 
 function projectsPath(workspaceDir: string): string {
-  return path.join(workspaceDir, "projects", "projects.json");
+  return path.join(workspaceDir, DATA_DIR, "projects.json");
 }
 
 export async function readProjects(workspaceDir: string): Promise<ProjectsData> {
+  await ensureWorkspaceMigrated(workspaceDir);
   const raw = await fs.readFile(projectsPath(workspaceDir), "utf-8");
   const data = JSON.parse(raw) as ProjectsData;