Real-harness verified

Key features

• compactionlossy digest, old details are lost after digest (unless spilled at the time)
• memory_search(query, limit, max_chars, file?): Do mixed (lexical + semantic) recall of the old content of this session, snippet is strictly bounded
• spilllarge results are moved out of the context, but the recall depends on the model's own read/grep guessing path
• The index (FTS5) only serves the caller's active search and never returns the model context.