Adds five role agents under .claude/agents/, each pinned to a model in
frontmatter (sonnet for developer/debugger/operator/tech-writer, opus
for quality-reviewer) and directed to read the relevant mvp-* skills
before acting. Replaces the model enforcement lost when c239bb9 deleted
enforce-agent-model.sh. Updates .claude/CLAUDE.md and root CLAUDE.md
indexes.
Co-Authored-By: Claude Fable 5 <[email protected]>
