# Core Memory Architecture Notes

## Core principles

- Preserve why behind changes, not only facts.
- Keep retrieval grounded and inspectable.
- Keep retrieval path read-only for index state.

## Differentiators

- Deterministic causal recall with explicit tie-break rules, stable ordering, and explainable replay metadata.
- Two-factor promotion gate (score + reinforcement) with adaptive thresholding to prevent promotion inflation.
- Session-start rolling-window injection for token-budgeted continuity, selected deterministically and idempotently.