fix(voice): send OpenAI Realtime tool schemas the API accepts

OpenAI Realtime now answers 400 invalid_function_parameters for a whole
session whose tool schema uses Unicode property classes, as resolve_area's
area-id pattern does, so voice never connects ("Failed to create Realtime
token"). The session sends its tools through chatSchema, the filter typed
chat adopted in #1616, which leaves out only \p{…} patterns; area ids are
still checked against the action's own contract before the tool runs.

Fixes #1618

server/providers/openai/chat.js

@@ -69,7 +69,7 @@ function validMessages(messages) {
  * 400 for a whole request whose tool uses Unicode property classes (`\p{L}`),
  * as `resolve_area`'s area ids do. Every argument is still checked against
  * the action's own contract before the tool runs, so the model loses a hint,
- * not a rule. Realtime voice accepts these patterns and keeps them.
+ * not a rule. Realtime voice refuses them too now (#1618) and uses this as well.
  */
 export function chatSchema(schema) {
   if (Array.isArray(schema)) return schema.map(chatSchema);

server/providers/openai/realtime.js

@@ -14,6 +14,7 @@ import {
 } from './constants.js';
 import { realtimeInstructions } from './instructions.js';
 import { GEV_REALTIME_TOOLS, offeredTools } from './tools.js';
+import { chatSchema } from './chat.js';
 import { resolveOverpassUpstreams } from '../overpass/constants.js';
 import {
   preferCodexOAuth,
@@ -128,6 +129,19 @@ function createRealtimeOAuthLoginHandler({
   };
 }
 
+/**
+ * The tools one Realtime session is offered, as OpenAI accepts them: it now
+ * refuses a whole session whose tool schema uses `\p{…}` patterns (#1618), as
+ * Chat Completions did (#1616), so voice drops the same pattern hints chat does.
+ */
+function realtimeSessionTools(tools, { overpass = false } = {}) {
+  return offeredTools(tools, { overpass }).map((tool) =>
+    tool.parameters
+      ? { ...tool, parameters: chatSchema(tool.parameters) }
+      : tool,
+  );
+}
+
 function createRealtimeTokenHandler({
   annotationGuidance,
   endpoint = 'https://api.openai.com/v1/realtime/client_secrets',
@@ -303,7 +317,7 @@ function createRealtimeTokenHandler({
           output: { voice },
         },
         instructions: realtimeInstructions(annotationGuidance, { overpass }),
-        tools: offeredTools(tools, { overpass }),
+        tools: realtimeSessionTools(tools, { overpass }),
         tool_choice: 'auto',
       },
     };
@@ -370,4 +384,5 @@ export {
   createRealtimeOAuthLoginHandler,
   createRealtimeOAuthStatusHandler,
   createRealtimeTokenHandler,
+  realtimeSessionTools,
 };