Module coherence 

Coherence tracking for kernel vector and graph stores.

Coherence metadata is co-located with each vector and graph node, enabling the scheduler and proof engine to make informed decisions.

Design (from ADR-087 Section 4.3)

• coherence_score: Structural consistency score (0.0-1.0)
• last_mutation_epoch: Epoch of the last mutation
• proof_attestation_hash: Hash of the proof that authorized the last mutation

The coherence-aware scheduler uses these signals to:

1. Prioritize tasks processing genuinely new information
2. Deprioritize tasks whose mutations would lower coherence
3. Fast-path mutations within coherent partitions

Structs

CoherenceConfig

Configuration for coherence tracking.

CoherenceTracker

Tracks coherence state for a collection of entries.