fix(opencode): ignore unknown config fields (#41312)

packages/opencode/test/config/config.test.ts

@@ -597,12 +597,12 @@ accountTokenIt.instance("resolves env templates in account config with account t
   }),
 )
 
-it.instance("validates config schema and throws on invalid fields", () =>
+it.instance("validates config schema and throws on invalid values", () =>
   Effect.gen(function* () {
     const test = yield* TestInstance
     yield* writeConfigEffect(test.directory, {
       $schema: "https://opencode.ai/config.json",
-      invalid_field: "should cause error",
+      model: 42,
     })
     const exit = yield* Config.use.get().pipe(Effect.exit)
     expect(Exit.isFailure(exit)).toBe(true)
@@ -1331,7 +1331,7 @@ it.instance("permission config preserves user key order", () =>
   }),
 )
 
-test("config parser preserves permission order while rejecting unknown top-level keys", () => {
+test("config parser preserves permission order while ignoring unknown top-level keys", () => {
   const config = ConfigParse.schema(
     ConfigV1.Info,
     {
@@ -1340,18 +1340,13 @@ test("config parser preserves permission order while rejecting unknown top-level
         "*": "deny",
         edit: "ask",
       },
+      plugins: ["example"],
     },
     "test",
   )
 
   expect(Object.keys(config.permission!)).toEqual(["bash", "*", "edit"])
-  try {
-    ConfigParse.schema(ConfigV1.Info, { invalid_field: true }, "test")
-    throw new Error("expected config parse to fail")
-  } catch (err) {
-    const error = err as { data?: { issues?: Array<{ code?: string; keys?: string[]; path?: string[] }> } }
-    expect(error.data?.issues?.[0]).toMatchObject({ code: "unrecognized_keys", keys: ["invalid_field"], path: [] })
-  }
+  expect(config).not.toHaveProperty("plugins")
 })
 
 // MCP config merging tests