feat(tui): Interactive Live TUI Dashboard with Real-Time DAG Visualization

[sdageltc]

Summary & Motivation

While letitloop provides lil status <goal_id> for viewing execution summaries, running complex multi-hour macro-tasks with 10+ interdependent contracts benefits greatly from a live, interactive Terminal User Interface (TUI).

---

Proposed Features

1. Live DAG Visualization:
   • Interactive ASCII/Unicode DAG tree showing nodes color-coded by state (DRAFTED, READY, WORKING, VERIFYING, QC_REVIEW, COMPLETE, FAILED).
2. Real-time Metrics Gauge:
   • Live token burn progress bar (prompt/completion spend vs. BudgetGuard ceiling).
   • Active lease timers and worker retry counts.
3. Live Log & Evidence Viewer:
   • Keybindings to select a contract node and view live stdout/stderr streams, verification check results, and impossibility theorem reports.
4. Technology:
   • Implement using Python rich / textual as an optional interactive UI (lil dashboard --live).

---

Key Files

• orchestrator/tui.py
• orchestrator/cli.py: Add lil dashboard subcommand.

---

Acceptance Criteria

• Interactive terminal UI that refreshes automatically as task states transition on disk.
• Smooth navigation via arrow keys and keyboard shortcuts (e.g. q to quit, tab to switch panes).
• Zero performance degradation on the underlying supervisor execution loop.