Add user command rule contract

README.md

@@ -40,3 +40,6 @@ Command simulation uses `bot-command-simulate-request.json` and
 real network requests require an explicit `use_real_request` flag; fixtures
 contain only local synthetic data.
 
+Named-user command rules use `bot-command-user-rule.json`; fixtures contain
+only synthetic Twitch IDs and literal response templates.
+

contracts/v1/bot-command-user-rule.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://trixie.invalid/contracts/v1/bot-command-user-rule.json",
+  "title": "Trixie named-user command rule",
+  "type": "object",
+  "additionalProperties": false,
+  "required": ["user_id"],
+  "properties": {
+    "user_id": { "type": "string", "pattern": "^[0-9]{1,64}$" },
+    "response_template": { "type": ["string", "null"], "minLength": 1, "maxLength": 2000 }
+  }
+}

fixtures/v1/bot-command-user-rule.json

@@ -0,0 +1,4 @@
+{
+  "user_id": "123456789",
+  "response_template": "Welcome back, ${user_name}!"
+}