fix(config): remove duplicate description annotation on timeout/chunkTimeout

The inner Union schema already carried the description. The outer
Schema.optional annotation re-applied it, producing duplicate entries
in SDK codegen output. Collapses to a single annotation.

Regression test: test/config/provider-schema.test.ts asserts each
description substring appears exactly once in the schema AST.

Addresses audit finding F1 (Opus diamond review, 2026-04-22).

Author: tesdal

packages/opencode/src/config/provider.ts

@@ -94,19 +94,13 @@ export const Info = Schema.Struct({
             description:
               "Timeout in milliseconds for requests to this provider. Default is 300000 (5 minutes). Set to false to disable timeout.",
           }),
-        ).annotate({
-          description:
-            "Timeout in milliseconds for requests to this provider. Default is 300000 (5 minutes). Set to false to disable timeout.",
-        }),
+        ),
         chunkTimeout: Schema.optional(
           Schema.Union([PositiveInt, Schema.Literal(false)]).annotate({
             description:
               "Timeout in milliseconds between streamed SSE chunks for this provider. If no chunk arrives within this window, the request is aborted. Defaults to 120000 (120s) for most providers, 600000 (10min) for Anthropic-family providers (to accommodate extended thinking). Set to false to disable.",
           }),
-        ).annotate({
-          description:
-            "Timeout in milliseconds between streamed SSE chunks for this provider. If no chunk arrives within this window, the request is aborted. Defaults to 120000 (120s) for most providers, 600000 (10min) for Anthropic-family providers (to accommodate extended thinking). Set to false to disable.",
-        }),
+        ),
       }),
       [Schema.Record(Schema.String, Schema.Any)],
     ),

packages/opencode/test/config/provider-schema.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, test } from "bun:test"
+import { ConfigProvider } from "../../src/config/provider"
+
+describe("ConfigProvider schema", () => {
+  test("chunkTimeout has exactly one description annotation", () => {
+    const json = JSON.stringify(ConfigProvider.Info.ast)
+    const needle = "Timeout in milliseconds between streamed SSE chunks"
+    const count = json.split(needle).length - 1
+    expect(count).toBe(1)
+  })
+
+  test("timeout has exactly one description annotation", () => {
+    const json = JSON.stringify(ConfigProvider.Info.ast)
+    const needle = "Timeout in milliseconds for requests to this provider"
+    const count = json.split(needle).length - 1
+    expect(count).toBe(1)
+  })
+})