{"component":"INSTITUTIONAL_MEMORY_LAYER","status":"CONTRACT_PUBLISHED","architecture":"Append-only SHA-384 hash chain — each entry hashes content + parent_hash. Immutable sequential record.","non_erasure_principle":"Committed DERs are preserved as verified parent state for subsequent turns. The Reckoner Machine reasons from accumulated governed context, not reconstructed noise.","provider_field_note":"Two fields record the provider per entry. meta.model = requested provider (routing choice). meta.SDI_DER.META.model_version = actual generating model string returned by API. These differ when the fallback chain activates. model_version is the authoritative field for which model generated the entry.","note":"Wix publishes the contract. External Logic Node (Vultr) enforces hashing and ledger writes.","enforcement_layers":{"compile_gate":{"endpoint":"/_functions/compile","role":"Deterministic DER validation. No writes."},"append_audit_and_commit":{"endpoint":"External Logic Node (Vultr)","role":"CAS ordering. Parent hash. RAI threshold. Write authority."}},"write_gate":{"requires_agent":true,"requires_der":true,"der_version":"SDI_DER_v1.1","requires_compile_pass":true},"entry_types":["EPISODIC","PRECEDENT","CALIBRATION","AUDIT","SYSTEM","MEMORY_COMPILE","SUPER_DER","MINT_PROOF","BIO"],"memory_architecture":{"hot_memory":"Last 64 EPISODIC entries available as direct context on every turn.","compiled_memory":"Every 64 entries, the memory compiler synthesizes a MEMORY_COMPILE entry capturing domain competence, prospective reckoning track record, high-strength signals, and correction history.","substrate_density":"Sd in the governance efficiency equation. Increases as the chain grows and memory compiler operates correctly. Zero interpretive overhead is structural: prior acts committed in same ILJO grammar, certified by same compile gate, retrieved by semantic search against current intent."}}