v0.3.5

Changed

• Default expand_primary_weight lowered to 0.5 (was 0.7) — gives AI-expanded terms more influence for intent-based queries. To restore the previous behavior, set expand_primary_weight: 0.7 in config.
• Default ai_summary_top_n raised to 10 (was 5) — AI sees more results and curates better for constraint queries and diverse result sets.
• Default ai_summary_max_chars raised to 4000 (was 2000) — supports the increased ai_summary_top_n with enough excerpt content for quality curation.