CK-QG1: bind reviewed R1B writer transition authority

[douglasmonsky]

Scope

Authority-only CK-QG1 v2 reconciliation for the exact reviewed CK-08R1B writer successor.

This binds:

• accepted-main writer predecessor 13da341fc2a3c50d8d7de7fd6a6fc2b0aca0dbc832a9b56597cd96ab67d17488
• reviewed PR Bind production answer semantics to the joined R1A/R1C contract #430 writer successor d163e6c566665a65062952be1618b9f2c4032eabd841408e2f274bcd29748a73
• unchanged baseline fda777e28db7a0696f29b55c9d694f99d987413b206d8e323f217b4fa6a73ad5
• exact 20-finding normalized digest 17bf73aa73ce9f70bb9837379acf976662418e6288913c77fa70efd4b5b443cc
• CK-08R1B final authority and the reviewed 23-path cohort

The authority preserves C/B/B thresholds, no text exemptions, deterministic normalization, release-size ratchet, privacy, spike checks, and fail-closed mismatch/new/worsened/improvement semantics. It binds mixed writer/baseline/authority/PR identities and negative mutations.

No production source, maintainability checker, baseline bytes, PR #430, CK-QG1 implementation acceptance, or downstream packet was changed. PR #430 remains open and unmerged; this authority does not grant implementation acceptance.

Validation

• Focused authority/docs/scope tests: 37 passed
• Full suite: 1407 passed, 1 skipped, 1 warning; performance lane 13 passed
• just vp: pass
• package build and check_release.py --dist: pass
• combined current-main/PR Bind production answer semantics to the joined R1A/R1C contract #430/mismatch/identity/new/worsened/improvement/no-exemption/scope preflight: pass
• GitNexus: up-to-date at fe8d536
• one bounded independent read-only reviewer: actionable scope assertion corrected; focused revalidation passed

Hosted CI is the final gate.