extract() routes to _extract_via_panel when HALACHA_PANEL_REGIME_ENABLED: the
3-model panel proposes → votes/score → approval rule → dedup vs corpus (known
links as citation, frees a cap slot) → cap HALACHA_PANEL_MAX_NEW genuinely-new
principles/decision (by score), rest dropped. Replaces single-model auto-approve;
legacy path kept as <2-judge fallback. db.store_panel_principles persists the
pre-decided verdict + source-aware canonical create/link (G9 reviewer=panel:...).
Dry-run validated on 29468-08-23: ~18 → 4 principles. 6 new tests; full suite 422 green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
