feat: Add run execution management with runtime adapters (ISSUE-005)

[proboscis]

Summary

• Implements run execution management for runbox (ISSUE-005)
• Adds RuntimeAdapter trait with BackgroundAdapter and TmuxAdapter implementations
• Extends Run structure with status, runtime, handle, log_ref, timeline, exit_code fields
• Adds CLI commands: ps, stop, logs, attach
• Updates run command with --runtime bg|tmux option
• Enhances show command with detailed run information

Key Features

Runtime Adapters

• BackgroundAdapter: Spawns processes in background with pid/pgid tracking
• TmuxAdapter: Spawns processes in tmux windows for interactive access

CLI Commands

Command	Description
runbox run -t <template> --runtime bg|tmux	Start a run in specified runtime
runbox ps [--status running]	List runs with automatic status reconciliation
runbox stop <run_id>	Stop a running process
runbox logs <run_id> [-f]	View run logs (with optional follow mode)
runbox attach <run_id>	Attach to tmux window
runbox show <run_id>	Show detailed run information

Architecture

┌─────────────────────────────────────────────────────┐
│ runbox core                                         │
│  - 台帳管理（Run CRUD）                              │
│  - ログファイル管理                                   │
│  - 状態遷移（status 更新）                           │
│  - reconcile（状態整合性チェック）                    │
└─────────────────────────────────────────────────────┘
                          │
                          ▼
┌─────────────────────────────────────────────────────┐
│ RuntimeAdapter trait                                │
│  - spawn(): プロセス起動 → RuntimeHandle            │
│  - stop(): 停止                                     │
│  - attach(): 端末接続                               │
│  - is_alive(): 生存確認                             │
└─────────────────────────────────────────────────────┘
         │                │
         ▼                ▼
┌─────────────┐  ┌─────────────┐
│ Background  │  │    Tmux     │
│   Adapter   │  │   Adapter   │
└─────────────┘  └─────────────┘

Test plan

• All existing tests pass (23 tests)
• New runtime adapter tests pass
• Manual testing of runbox run --runtime bg with a template
• Manual testing of runbox ps to list runs
• Manual testing of runbox stop to stop a run
• Manual testing of runbox logs -f to follow logs
• Manual testing of runbox run --runtime tmux (requires tmux)
• Manual testing of runbox attach (requires tmux)

Related Issues

• Implements: ISSUE-005 (Run Execution Management)
• Depends on: ISSUE-001 (Run/RunTemplate/Playlist Spec)
• Related: ISSUE-006 (Short ID Support) - partially implemented

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