feat: extract restart operation to core/operations/restart.ts

[2witstudios]

Summary

• Extracted restart business logic from commands/restart.ts into core/operations/restart.ts with a reusable performRestart() function
• Simplified commands/restart.ts to a thin CLI wrapper (arg parsing + output formatting)
• Added 8 tests covering: tmux window creation, manifest updates (new agent added, old agent marked gone), old agent cleanup, prompt override, error cases

Test plan

• npm run typecheck passes (no new errors)
• npm test — all 201 tests pass (8 new), pre-existing cron-parser failures unchanged
• JSON output shape unchanged for backwards compatibility

Closes #60

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 8087a17.

📒 Files selected for processing (5)

• src/commands/restart.ts
• src/commands/spawn.test.ts
• src/core/operations/restart.test.ts
• src/core/operations/restart.ts
• src/lib/errors.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/issue-60-restart-op

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