B300 subnet-307 FE v9 candidate archive

Immutable archive for the FE v9 candidate (audit-graph-parity revision of the v6 fused AR+residual+RMSNorm epilogue).
content_hash: 747405b41845506800939507a93b6011d38f5a94e69a5ec303a3d39a48e77709
archive sha256: e074e04e954579c69b1e2e43a7b4dd7868150e4fb6cd4f4baa1ee60bf1b04b61
Change vs v6 (content 179840a7…): the cross-rank reduce and residual add round at the stock baseline's exact bf16 boundaries (sequential rank-order bf16 adds; bf16 residual add feeding both outputs). Hermetic 50k-call stockcheck: residual_out bit-identical to stock, zero violating calls. This asset must never be modified or replaced.