* Rework faux-redaction audit per maintainer review
- Paint-order aware: a rectangle counts as a cover only when painted
strictly after the text (positions from the joined content stream).
- Colour-aware: WCAG contrast between text and cover must be below 3.0,
so page backgrounds, table shading and highlights are not flagged.
- Fail closed: audit_redactions returns Err on undecodable content
streams (decoded_strict) and malformed /Annots; the operator bound is
an error, not a silent truncation.
- Graphics state carries across a page's content streams (one joined
walk); form XObjects still isolate their state at Do.
- Audit-only: the sanitize-for-sharing half is dropped (upstream #162).
- Parity entry marked partial, not shipped.
* Audit: register its layer, add a README, fail closed past 32 nested forms, document what it doesn't check
---------
Co-authored-by: Erick Barraza <ejbarraza1994@gmail.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
21d5323132