07 - Cross-Collection Collision Review

Verdict

Current positive-delta scope has zero collision, but collision architecture remains unsafe.

Tier1/Tier2/Tier3 positive-delta rows currently show zero prospective collision. Live planner found 103 collisions elsewhere: pivot_results=98 and pivot_definitions=5. Guard false-passes because it filters expected_delta>0. Core fn_birth_register is entity-code-only and silently skips a collision; other callers can bypass the QT001 writer. birth_registry.entity_code is globally unique, coupling collection namespaces.

Patch shared core before any apply. Owner must separately decide canonical global entity_code namespace versus collection/entity composite identity; do not change the index without a dedicated identity-law migration.