fix: preserve runtime option defaults (#38118)

packages/server/src/options.ts

@@ -7,7 +7,7 @@ export const ServerOptions = Schema.Struct({
   client: Schema.optional(Schema.String),
   hostname: Schema.optional(Schema.String),
   port: Schema.optional(
-    Schema.Int.check(Schema.isGreaterThanOrEqualTo(1), Schema.isLessThanOrEqualTo(65_535)),
+    Schema.Int.check(Schema.isGreaterThanOrEqualTo(0), Schema.isLessThanOrEqualTo(65_535)),
   ),
   password: Schema.optional(Schema.String),
   simulation: Schema.optional(Schema.Boolean),

packages/server/src/routes.ts

@@ -30,7 +30,7 @@ import { SdkPlugins } from "@opencode-ai/core/plugin/sdk"
 import { ToolOutputStore } from "@opencode-ai/core/tool-output-store"
 import { WellKnown } from "@opencode-ai/core/wellknown"
 import { Watcher } from "@opencode-ai/core/filesystem/watcher"
-import { HttpRouter, HttpServer } from "effect/unstable/http"
+import { HttpRouter } from "effect/unstable/http"
 import { HttpApiBuilder } from "effect/unstable/httpapi"
 import { Context, Effect, Layer, Option } from "effect"
 import { Api } from "./api"
@@ -143,5 +143,3 @@ function makeRoutes<AuthError, AuthServices>(
     }),
   )
 }
-
-export const webHandler = () => HttpRouter.toWebHandler(createRoutes().pipe(Layer.provide(HttpServer.layerServices)))

packages/server/test/options.test.ts

@@ -0,0 +1,14 @@
+import { expect, test } from "bun:test"
+import { ServerOptions } from "@opencode-ai/server/options"
+import { Option, Schema } from "effect"
+
+const decode = Schema.decodeUnknownOption(ServerOptions)
+
+test("accepts ephemeral port zero", () => {
+  expect(Option.isSome(decode({ port: 0 }))).toBe(true)
+})
+
+test("rejects ports outside the valid range", () => {
+  expect(Option.isNone(decode({ port: -1 }))).toBe(true)
+  expect(Option.isNone(decode({ port: 65_536 }))).toBe(true)
+})