Link inference contract from card (scamguard_sys_v1)

README.md

@@ -62,6 +62,18 @@ model-index:
             value: 0.000
 ---
 
+## Inference contract
+
+Running this model correctly requires its **frozen inference contract** — the exact
+system prompt, output JSON schema, user-turn format, and constrained-decode spec it
+was trained against. See [`inference_contract/`](./inference_contract):
+
+- [`INFERENCE.md`](./inference_contract/INFERENCE.md) — wiring guide: system prompt, user turn `[channel: <tag>]\n<message>` (tag `sms`/`email`/`chat`), **constrained JSON decoding** (required — pins the enums), and the verbatim-evidence check.
+- [`prompt_scamguard_sys_v1.txt`](./inference_contract/prompt_scamguard_sys_v1.txt) — the system prompt, verbatim.
+- [`schema_scamguard_v1.json`](./inference_contract/schema_scamguard_v1.json) — output JSON Schema for constrained decoding.
+
+Prompt version `scamguard_sys_v1`. Do not edit the prompt/schema; the weights are trained against them.
+
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