v0.4.1

Changes

• Replace RRF (Reciprocal Rank Fusion) with additive FTS boost in search_items(), recovering ~10pp on Recall@1
• The additive boost (0.08 / (1 + fts_rank)) preserves vector similarity magnitude while using FTS as a targeted keyword tie-breaker

Benchmark (1000 memories, 200 queries)

Approach	Recall@1	Recall@5	MRR
Additive boost (0.08)	46.5%	73.0%	59.2%
RRF (K=60)	37.0%	73.5%	53.2%