Plan One Shot

Replicate Antigravity plan-mode behavior using three artifacts and strict review gates.

Hard Rules

1. Before approval: plan only. No code edits, no mutating commands, no commits.
2. Always produce or update these artifacts together:
   • .exspecso/<plan-name>/task.md
   • .exspecso/<plan-name>/implementation_plan.md
   • .exspecso/<plan-name>/walkthrough.md (stub only during planning)
3. Match plan depth to scope.
4. Block execution until user says exactly: Execute Plan.
5. Do not skip artifact generation even for short tasks.
6. After approval: execute strictly in task.md order and update statuses continuously.
7. For existing projects, preserve architecture, naming, folder layout, and dependency choices unless the user asks for a change.
8. Prefer minimal diff; do not introduce new abstractions/libraries unless justified by at least two concrete reuse points or a clear blocker.
9. First call in a new conversation defaults to new planning. Do not infer an active plan from .exspecso/ history.
10. Only resume prior plan artifacts when the user explicitly asks to continue/resume an existing plan.