Why: Provide phased rollout roadmap (Phases 1-5) for stock repositories and mandatory defaults for new projects under governance v2. Evidence: Specification documented in docs/superpowers/specs/2026-10-16-stock-repos-adoption-matrix.md. Impact: Clarifies U6 and U7 governance deliverables for multi-repo rollout without ambiguity. Refs: feature/development-governance-v2