feat: parallel-first planning with dependency graphs and checkpoint-resume
- plan-phase.md: dependency-first planning, vertical slices default
- phase-prompt.md: autonomous field, wave structure, frontmatter table
- scope-estimation.md: parallel default, removed "parallel-aware" framing
- plan-format.md: frontmatter docs with depends_on, files_modified, autonomous
- execute-phase.md: checkpoint-resume flow using Task resume parameter
Plans now declare explicit dependencies via frontmatter. Wave assignment
is automatic based on depends_on + files_modified. Checkpoints pause
subagent, return to orchestrator, user responds, orchestrator resumes.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>