{"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. Model reasons from accumulated governed context, not reconstructed noise.","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_mint":true,"requires_der":true,"der_version":"SDI_DER_v1.1","requires_compile_pass":true},"entry_types":["EPISODIC","PRECEDENT","CALIBRATION","AUDIT","SYSTEM"]}