generated from coulomb/repo-seed
Fixes C-1/C-2. Incremental change-driven maintenance (notify->delta) is primary; full rebuild is a rare, envelope-respecting, concurrent fallback (not required cheap). Equivalence via blocking/LSH candidate-gen + verify + incremental maintenance, replacing O(N^2). Index is derived, per-tenant. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>