docs(sec): post-reparse verification and cutover recommendation
Closes the parity investigation: prod reparse runs 6+7 reconciled against the dry run, the collision check that caught the BEN regression (and its residue -- 36 historical 53-week-drift rows, deliberately left), and the 2026-07-24 parity report diffed against the 2026-07-23 baseline. Candidate coverage 482 -> 504 of 511 with the gap fully explained (PSKY/Q new registrants, FITB guard-tripped with no revenue), agreement unchanged where both sides exist, and the remaining deltas are documented definition differences. Includes the after-report and a correction to the seventh pass (FITB loses its score, not just one input). Recommends approving the A5 cutover with KLAC as the one carried caveat. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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