v0.2.0 — Grok CLI support

Added

• Grok CLI (xAI) support — full parity with the other agents:
  • Status derived from Grok's own events.jsonl tail: permission_requested
    without a later permission_resolved shows the pulsing "needs you" alert
    (with the tool it's asking about); turn_started/turn_ended map to
    working/idle. No hooks exist in Grok — agent-bar watches
    ~/.grok/sessions/ directly, nothing to install.
  • Tokens from updates.jsonl turn_completed records (input, output +
    reasoning, cache-read), deduplicated by prompt_id.
  • Context-window fill (ctx %) from the last turn's input (500k default).
  • Grok appears in the session menu with its own dot color, in
    agent-bar stats, and in agent-bar doctor.
  • Price table defaults to 0 (subscription-based); real costUsdTicks from
    Grok transcripts is on the roadmap.