feat: dashboard should show tasks from all executors, not just crib SSH

[jimmy-claw]

The web dashboard at http://pi5.local/status currently only polls task metadata from the crib SSH executor. Local and container executor tasks are not visible.

Expected behavior

All executor backends (SSH, local, container) should surface tasks in the dashboard.

Possible approaches

1. The dashboard server reads from the local metadata dir (~/.local/share/openclaw/tasks/) in addition to SSH-fetched tasks
2. The openclaw-agent list --json output becomes the single source of truth for the dashboard (already aggregates all executors)
3. A small agent/daemon syncs task state from all executors into a central store

Option 2 is simplest — dashboard calls and renders all tasks regardless of executor type.

Related

• Issues feat: native task completion callback — remove need for openclaw system event in prompts #6, feat: generalize executor to support arbitrary shell commands (not just Claude Code) #7 (shell command executor + completion callbacks)