feat: configurable consolidation batch size for verbatim storage mode

[salishforge]

Hardcoded BATCH_SIZE=50 in consolidation prevents per-session warm rows. Add CONSOLIDATION_INNER_BATCH_SIZE env var (default 50, min 1). Setting to 1 enables verbatim storage where each memory gets its own warm row with embedding — critical for retrieval quality. Inspired by MemPalace (MIT) "store everything, make it findable" philosophy.