File resolution is now by index (<index>.pdf), not the datei/file
column. Update the ADR-025 security sub-decision and consequence (the
recursive walk and file column are gone; a bad index skips its row with
a loud SkipReason, a symlink-escape still aborts via the containment
assertion) and DEPLOYMENT §6 (PDFs must be named <index>.pdf flat in
the import dir).
Refs #686
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>