feat: add doctor subcommand for read-only optimization audit

[cs50victor]

• Adds frd doctor: read-only audit of which catalog optimizations are applied; writes and runs nothing
• Exits non-zero when any state-based optimization is pending, so it works as a CI / pre-commit check
• Reuses status_of (now crate-visible) to classify items, mirroring the wizard's pending/applied split
• Recurring Run actions (sweep) can't be detected as "done", so they're listed under Maintenance and excluded from the pass/fail verdict
• New doctor module mirrors wizard as the other command's presentation; no new dependencies

Validation: cargo fmt/clippy/test clean; verified exit 1 on a fresh project and exit 0 against a fully-optimized fixture