Bad-data sweep + revise-request comments sent (26 prácticas)

Bad-data sweep across 6 client-required práctica fields (fecha/sede/rol/DNI/HC/sexo/DOB): 26 prácticas flagged (24 DOB age-at-proc out of range, 3 DNI sentinel 99999999, 1 overlap), thread-scope comment+email sent as Elazar admin identity. Elazar direct go 2026-07-13. 26 comments posted, 31/31 emails delivered, 0 failures, DB-verified notifiedAt-stamped. Idempotent+snapshotted via scripts/comment-bad-practica-data.ts (fork of comment-future-practicas.ts safety scaffold). pacienteDob left untouched (nudge-only).