Coding guidelines verifier

Goal

Validate that changes follow the nearest nested AGENTS.md:

• default: changed files only
• default: auto-fix formatting before lint/tests
• monorepo-aware: each module’s AGENTS.md is the source of truth for that scope

Workflow (checklist)

1. Collect changed files (staged + unstaged + untracked).
2. For each changed file, find the nearest parent AGENTS.md.
   • If a file has no scoped AGENTS.md, report it (suggest running coding-guidelines-gen).
3. Parse the codex-guidelines block (schema: references/verifiable-block.md).
4. Run, per scope:
   • format (auto-fix) -> lint -> tests
   • apply simple forbid rules (globs/regex) from the block
5. Produce a short compliance report (template: references/report-template.md).