Context

run_consolidation_sweep in crates/zeph-memory/src/consolidation.rs has no unit test covering its orchestration logic. The function drives the MERGE/UPDATE decision loop, clustering, and result counters.

What to test

• result.merges, result.updates, result.skipped counters are correctly incremented
• embedded.len() < 2 guard exits early with zero ops
• The Update op DB path (content replacement) executes and updates the correct row

Acceptance criteria

#[tokio::test] tests in consolidation.rs covering the above cases with an in-memory SQLite pool.

Discovered in PR #2358 tester review.