Adopt managed Cratis AI distribution

[einari]

Changed

• Adopt the managed Cratis AI corpus for Claude, Codex, Copilot, Cursor, OpenCode, and Pi.
• Select profiles: cratis/documentation, cratis/engineering/typescript.
• Select languages: typescript, python.
• Preserve project-owned rules and custom skills outside the managed ownership manifest.
• Migrate legacy project instructions into focused concern files under .cratis/ai/rules/project/ when present.

Verification

• cratis ai status reports no available update and no modified managed files.
• Every supported harness integration resolves.
• Non-application repositories contain no vertical-slice rule.
• git diff --check passes.