Implement GitHub issues end-to-end

Implement all tasks for a GitHub issue

Project execution when you need parallel Astronauts to implement task batches with FC verification and worktree commits.

• · issue_number
• · repo
• · plan (tasks with depends_on, files, acceptance criteria)

• · completed tasks committed to worktree; if plan problem encountered, human must resolve

• · Astronaut agents
• · Flight Controller verifier
• · git/worktree CLI

Worktree must be initialized; tasks must have dependency graph; git must be able to write.

Task depends on unsatisfied dep (cycle or missing); file conflicts in parallel batch; Astronaut hits >3 attempts (human must intervene).