Subagent-Driven Development

Dispatch fresh subagent per task with two-stage review after each.

Core principle: Fresh subagent per task + two-stage review (spec then quality) + diff-based validation = high quality, fast iteration

Quick Reference

Phase	Actor	Action	Exit Condition
1	Controller	Read plan, extract tasks, capture BASE_SHA, create task list	All tasks tracked with BASE_SHA
2	Subagent	Implement (templates/implementer.md)	Commit exists + tests pass + report includes HEAD_SHA
3	Subagent	Spec review (templates/spec-reviewer.md)	Reviewer checked diff(BASE..HEAD) and returned ✅ or file:line issues
4	Subagent	Quality review (templates/code-quality-reviewer.md)	Reviewer approved diff or returned severity-tagged issues
5	Controller	Update state, mark complete, loop to step 2	All tasks done
6	Subagent	Final review of entire implementation	Approved
7	Controller	Use finishing-a-development-branch	Branch complete