schema.sql had drifted badly enough that a newcomer running it got a database the
code partly fails against. Missing entirely: error_log, llm_events, and the four
eval_* tables. Missing columns: talks.dok_id (written by every ingest run),
talks.summary_embedding, talks.arguments/arguments_corrected/tagging_failed,
debates.summary_embedding, and four chat_snapshots columns including llm_messages.
Six indexes were undocumented, among them both HNSW summary-embedding indexes.
Also removed `*.sql` from .gitignore in the previous commit, which is why 14 of the
16 migration files could be recovered at all.
This has to be right before the rename lands, since everything downstream treats
schema.sql as the definition of truth.
Verified by building a scratch database from schema.sql and diffing it against
production: 251 columns across 22 tables and all 66 indexes identical.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>