Address PR #687 review concern (Elicit): add an ADR-025 Consequences
entry noting INDEX_PATTERN accepts only the current corpus shape (<=4
Latin-1 letters, hyphens, ASCII digits, optional x) and must be revisited
deliberately if the catalog scheme grows (5-letter prefix, digit-led id,
non-Latin letter), since such rows would otherwise be skipped, not
imported. Also records the ASCII-only \d intent.
Refs #686
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>