fix(core): accept null context length from LM Studio models (#63198)

packages/core/src/plugin/provider/lmstudio.ts

@@ -11,7 +11,8 @@ const RemoteModel = Schema.Struct({
       config: Schema.Struct({ context_length: Schema.Int }),
     }),
   ),
-  max_context_length: Schema.Int,
+  // Null for decision models whose context is unknown.
+  max_context_length: Schema.NullOr(Schema.Int),
   capabilities: Schema.Struct({
     vision: Schema.Boolean,
     trained_for_tool_use: Schema.Boolean,

packages/core/test/plugin/provider-lmstudio.test.ts

@@ -74,7 +74,7 @@ describe("LMStudioPlugin", () => {
                   key: "clef-flash",
                   display_name: "Clef Flash",
                   loaded_instances: [],
-                  max_context_length: 262_144,
+                  max_context_length: null,
                 },
               ],
             }),