README.md

Docs

• upgrade_design.md: target architecture and migration plan
• baseline_verification.md: baseline commands + verification notes
• release_checklist.md: pre-release verification checklist (build/test/assets/rollback)
• project_instructions.md: how AGENTS.md / AGENTS.override.md / legacy CLAUDE.md are discovered and merged
• _archive/: archived/low-value historical docs