Episodic truth layer

The episodic truth layer is the system's ground truth: the permanent, unmodified record of everything the system has actually experienced. Where the associative memory layer stores searchable metadata and compressed representations for fast retrieval, the episodic truth layer stores the complete, uncompressed payloads - every field of every experience event, every raw reasoning trace, every arbitration record. Nothing in the episodic truth layer is ever modified after writing; it is append-only by design. This immutability is what makes it trustworthy as a compliance record and a replay source. When the consolidation pipeline produces a semantic abstraction, it stores the abstraction in the associative memory layer but preserves the original episodic events it was derived from in the episodic truth layer unchanged. If the consolidation logic has a bug, the original events can be replayed through a corrected consolidation pipeline without data loss. The object_storage_key field in every OpenSearch memory record is the pointer that links the indexed representation back to the full payload in object storage, making the two layers work as a coherent system.