Normalize uploaded documents into structured markdown, add clearer parser
errors for missing dependencies, and cover the ingestion flow with
backend tests. This also replaces deprecated UTC timestamp helpers in
the touched backend paths so the knowledge pipeline stays warning-free.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Make runtime log queries support request correlation and date-range diagnostics with shared filtering semantics so the log page can use one consistent contract.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
