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/setup.ts

@@ -14,7 +14,7 @@ export function createSetupTool(api: OpenClawPluginApi) {
   return (ctx: ToolContext) => ({
     name: "setup",
     label: "Setup",
-    description: `Execute DevClaw setup. Creates AGENTS.md, HEARTBEAT.md, projects/projects.json, and model level config. Optionally creates a new agent with channel binding. Called after onboard collects configuration.`,
+    description: `Execute DevClaw setup. Creates AGENTS.md, HEARTBEAT.md, devclaw/projects.json, devclaw/prompts/, and model level config. Optionally creates a new agent with channel binding. Called after onboard collects configuration.`,
     parameters: {
       type: "object",
       properties: {