nx_optimizer_milestone_attest.nx

nx_optimizer_milestone_attest.nx -- substrate-native attribution for the alloca-load-fold peephole shipped 2026-05-20. REPLACES "the right commit message" with a hash-chained attestation that cannot be silently overwritten by parallel-agent `git add -A`. Per [[NISHI_STORAGE_SUBSTRATE_ROADMAP]] vs Git row of the EXCEED matrix: native SHA-256 + L1 append-only journal + tamper-detect chain. Git only has refs.log; we ship cryptographic linkage. What this program emits: 1. nx_blob_store_put(patched_codegen_source) -> hash A content-address of nx_x86_64_ctx.nx after the peephole edit 2. nx_blob_store_put(emitted_asm) -> hash B content-address of peephole_tightloop.s the self-host produced 3. nx_blob_store_put(attestation_payload) -> hash C content-address of the metrics description 4. nx_journal_log_append three entries (schema 20260520) -> seq 0,1,2 5. nx_journal_log_verify_chain -> must return -1 (chain intact) 6. nx_journal_log_latest_hash -> the chain head; the canonical identity of this optimizer milestone, independent of git To re-verify any time later: rerun this program against the same inputs; identical hashes mean nothing was tampered.