feat(cli): improve status and log commands

[lauritsk]

Problem

Users need easier live visibility into active/historical agent and orchestrator runs.

Proposal

Add watchable status, log inspection, JSON output, and run pruning.

pid agent status --watch <run-id>
pid agent logs <run-id>
pid orchestrator status --json <run-id>
pid runs prune --older-than 30d

Scope

• In scope:
  • Watch mode with refresh interval and clean exit.
  • Log command that finds and prints session/event logs for a run.
  • JSON status output for scripting.
  • Prune old completed run state/logs with dry-run or confirmation.
  • Tests/docs.
• Out of scope:
  • Terminal UI dashboard.
  • Background daemon.

Acceptance criteria

• Watch mode updates status until run reaches terminal state or user interrupts.
• Logs command shows useful run/session/event logs.
• JSON output is stable and documented.
• Prune refuses unsafe deletion without confirmation/dry-run clarity.
• mise run check passes or exception documented.