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README.md

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+# urd-diac-base-1.0
+
+Urdu diacritization, base tier (run-066): byt5-base seq2seq on the
+full 573,130-pair urdu-diacrit corpus. IMF v1 **fp16**.
+
+## Metrics (full 11,940-row test split, raw char CER, row-mean)
+
+CER **3.57** (urd-diac-1.0 small tier: 3.77 baseline) — gate PASSED.
+Word accuracy 69.8%.
+
+## Artifact parity (WO51 contract)
+
+Single-row greedy decode, the runtime's actual decode mode: ONNX
+artifact CER **3.64** — identical to torch on **500/500 rows**
+(agreement 1.0; three-way bf16/fp32/ORT agreement 1.0). Batched
+decode without an attention mask is outside the artifact contract
+(CONFORMANCE.md).
+
+## Conformance
+
+The shipped runtime reproduces all 12 frozen vectors byte-exactly
+(`conformance/urd-diac-base-vectors.json`).
+
+## Data / license
+
+Weights depend on the original training-data license (the urdu-diacrit
+corpus; provenance in `corpora/PROVENANCE.md`, owner-approved ship
+decision 2026-10-18). Code and weights: BSD-3-Clause.