Module proactive 

Proactive recall — automatically inject relevant memories into context.

Implements 3-step selective recall:

1. ROOT index triage (O(1) topic lookup)
2. Manifest-based selection (keyword matching)
3. HNSW vector search (semantic similarity)

Only triggered at session start and topic transitions to avoid context bloat.

Structs

ProactiveRecall

Proactive recall engine.

RecallTiming

Tracks when proactive recall should be triggered.