agentic-sdd-planlisted

# Agentic SDD Plan Use this skill after the spec is clear enough to design the technical approach. ## Goal Create `specs/<feature>/plan.md` and related planning artifacts. Do not implement code in this phase. ## Required Reading - `.specify/memory/constitution.md` - `docs/vision.md` - `specs/<feature>/spec.md` - `specs/<feature>/clarify.md`, if present - relevant ADRs in `docs/adr/` - relevant source files and tests - existing API contracts, schemas, migrations, and deployment config when affected ## Research Rules Use Exa advanced search when: - a framework, SDK, or platform behavior may have changed - security guidance is current-version sensitive - a public API contract is involved - the plan depends on official docs Prefer official docs, maintained repositories, standards, and primary sources. Record only facts that affect the plan. ## Plan Sections Create or update `specs/<feature>/plan.md` with: - summary - inputs reviewed - assumptions - architecture approach - affected modules - API and contract changes - data model changes - dependency changes with alternatives and approval status - security impact - authorization boundaries - observability impact - testing strategy - failure modes - rollback and recovery - risks and mitigations - human architecture approval status Create additional files when relevant: - `data-model.md` - `contracts/openapi.yaml` - `contracts/events.md` - `test-plan.md` - ADR draft in `docs/adr/` ## Architecture Rules - Prefer existi