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/dispatch.ts

@@ -151,7 +151,7 @@ export async function dispatchTask(
 
   const resolvedConfig = await loadConfig(workspaceDir, project.name);
   const resolvedRole = resolvedConfig.roles[role];
-  const model = resolveModel(role, level, pluginConfig, resolvedRole);
+  const model = resolveModel(role, level, resolvedRole);
   const worker = getWorker(project, role);
   const existingSessionKey = getSessionForLevel(worker, level);
   const sessionAction = existingSessionKey ? "send" : "spawn";