Adds three new violation classes to the audit script:
2. Bare subscripts: flags `_{lat}`, `_{hw}`, `_{vol}`, `_{peak}`, `_{req}`,
and other multi-letter labels that should be wrapped per book-prose §2.
Provides direct visibility into Bucket-B-style notation drift.
3. Operators spacing (stub): placeholder for `\times` / `\cdot` spacing
hygiene. Currently no-op, ready for future tightening.
4. BW vs \text{BW} (stub): placeholder for bare BW detection in math.
Also tightens the existing Iron Law check to use the simpler regex
`R_{\text{peak}}\\cdot\\eta` instead of the previously over-escaped form.