chore(v1.10): rules-audit fixes - author_title items 1-8

[jameskhair-code]

Item 1 of the v1.10 preflight (docs/planning/v1.10-charter.md). Prompt-content only — no code changes.

What changed

The eight rules-content findings from the 2026-06-10 title/author audit, in priority order:

1. T-SER-02 contradictory example (rules/author_title.md): the WRONG line showed the correct transformation, byte-identical to the RIGHT line. It now shows the actual failure mode (leaving the series parenthetical unchanged).
2. T-SUB-07 duplicated alternative: separated by " / " (or " / ") — both strings identical; now (or "/" without spaces).
3. GEN-01 vs output format: aligned the no-change note to "Already correctly formatted." — the string the output format mandates. ai/authors.py:128 tolerates both strings case-insensitively, so this is prompt-only.
4. GEN-07 notes style: examples harmonized on rule-ID citations ("Removed marketing suffix per T-AWD-04") for review/calibration traceability.
5. A-MUL bridge note: the section's separator rules describe parsing the stored single-string field; a new note maps that onto the JSON authors-array output — one person per element, no "&" inside an element except single corporate names (A-ROL-11 / A-SPE-07).
6. A-MUL-05: the flag now triggers on "et al." alone, not "more than three authors AND et al."
7. T-CAP-10: the stylistic-lowercase example was an author (bell hooks); replaced with a real lowercase title ("milk and honey", Rupi Kaur).
8. confidence.md SECTION CONF index: now lists author_title.md with a pointer to the inline GEN-02..GEN-05 guidance.

Audit item 9 (normalize.py typographic quotes) stays parked on the roadmap pull-list pending the mapping sign-off.

Verification

• python -m pytest -q — 639 passed.
• Real-library smoke (per the charter's gate for this item): two clean-titles --dry-run batches of 8 against the live library.
  • Batch 1 (not #mqg_title_author:true): 8/8 already clean; no-change responses parsed cleanly.
  • Batch 2 (titles with parens/colons): 6 changes suggested, 2 already clean. All six proposals correct (Tier-A subtitle removal, author-prefix strip, T-FMT-09 dash fix, 3x T-SER-01 volume standardization), and the notes came back in the new rule-ID-citation style. ~$0.02, no writes.

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