Errands now create worktrees via ProcessManager.createWorktreesForProjects()
into agent-workdirs/<alias>/<project.name>/ instead of repos/<project>/.cw-worktrees/<errandId>.
This makes getAgentWorkdir + resolveAgentCwd work correctly for all agent types.
Key changes:
- Extract createWorktreesForProjects() from createProjectWorktrees() in ProcessManager
- Add resolveAgentCwd() to ProcessManager (probes for .cw/output in subdirs)
- Add projectId to SpawnAgentOptions for single-project agents (errands)
- Skip auto-cleanup for errand agents (worktrees persist for merge/abandon)
- Errand router uses agentManager.delete() for cleanup instead of SimpleGitWorktreeManager
- Remove cwd parameter from sendUserMessage (resolves via worktreeId)
- Add pruneProjectRepos() to CleanupManager for errand worktree refs
c52fa86542