fix(cli): validate and detect OpenCode Go install settings

Reject invalid --opencode-go values during non-TUI installs and detect existing OpenCode Go usage from the generated oh-my-opencode config so updates preserve the right defaults.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/cli/config-manager/detect-current-config.ts

@@ -10,17 +10,30 @@ function detectProvidersFromOmoConfig(): {
   hasOpencodeZen: boolean
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
+  hasOpencodeGo: boolean
 } {
   const omoConfigPath = getOmoConfigPath()
   if (!existsSync(omoConfigPath)) {
-    return { hasOpenAI: true, hasOpencodeZen: true, hasZaiCodingPlan: false, hasKimiForCoding: false }
+    return {
+      hasOpenAI: true,
+      hasOpencodeZen: true,
+      hasZaiCodingPlan: false,
+      hasKimiForCoding: false,
+      hasOpencodeGo: false,
+    }
   }
 
   try {
     const content = readFileSync(omoConfigPath, "utf-8")
     const omoConfig = parseJsonc<Record<string, unknown>>(content)
     if (!omoConfig || typeof omoConfig !== "object") {
-      return { hasOpenAI: true, hasOpencodeZen: true, hasZaiCodingPlan: false, hasKimiForCoding: false }
+      return {
+        hasOpenAI: true,
+        hasOpencodeZen: true,
+        hasZaiCodingPlan: false,
+        hasKimiForCoding: false,
+        hasOpencodeGo: false,
+      }
     }
 
     const configStr = JSON.stringify(omoConfig)
@@ -28,10 +41,17 @@ function detectProvidersFromOmoConfig(): {
     const hasOpencodeZen = configStr.includes('"opencode/')
     const hasZaiCodingPlan = configStr.includes('"zai-coding-plan/')
     const hasKimiForCoding = configStr.includes('"kimi-for-coding/')
+    const hasOpencodeGo = configStr.includes('"opencode-go/')
 
-    return { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding }
+    return { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo }
   } catch {
-    return { hasOpenAI: true, hasOpencodeZen: true, hasZaiCodingPlan: false, hasKimiForCoding: false }
+    return {
+      hasOpenAI: true,
+      hasOpencodeZen: true,
+      hasZaiCodingPlan: false,
+      hasKimiForCoding: false,
+      hasOpencodeGo: false,
+    }
   }
 }
 
@@ -72,11 +92,12 @@ result.isInstalled = plugins.some((p) => p.startsWith(OLD_PACKAGE_NAME) || p.sta
   const providers = openCodeConfig.provider as Record<string, unknown> | undefined
   result.hasGemini = providers ? "google" in providers : false
 
-  const { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding } = detectProvidersFromOmoConfig()
+  const { hasOpenAI, hasOpencodeZen, hasZaiCodingPlan, hasKimiForCoding, hasOpencodeGo } = detectProvidersFromOmoConfig()
   result.hasOpenAI = hasOpenAI
   result.hasOpencodeZen = hasOpencodeZen
   result.hasZaiCodingPlan = hasZaiCodingPlan
   result.hasKimiForCoding = hasKimiForCoding
+  result.hasOpencodeGo = hasOpencodeGo
 
   return result
 }

src/cli/config-manager/plugin-detection.test.ts

@@ -10,10 +10,12 @@ import { addPluginToOpenCodeConfig } from "./add-plugin-to-opencode-config"
 describe("detectCurrentConfig - dual name detection", () => {
   let testConfigDir = ""
   let testConfigPath = ""
+  let testOmoConfigPath = ""
 
   beforeEach(() => {
     testConfigDir = join(tmpdir(), `omo-detect-config-${Date.now()}-${Math.random().toString(36).slice(2)}`)
     testConfigPath = join(testConfigDir, "opencode.json")
+    testOmoConfigPath = join(testConfigDir, "oh-my-opencode.json")
 
     mkdirSync(testConfigDir, { recursive: true })
     process.env.OPENCODE_CONFIG_DIR = testConfigDir
@@ -85,6 +87,23 @@ describe("detectCurrentConfig - dual name detection", () => {
     // then
     expect(result.isInstalled).toBe(false)
   })
+
+  it("detects OpenCode Go from the existing omo config", () => {
+    // given
+    writeFileSync(testConfigPath, JSON.stringify({ plugin: ["oh-my-openagent"] }, null, 2) + "\n", "utf-8")
+    writeFileSync(
+      testOmoConfigPath,
+      JSON.stringify({ agents: { atlas: { model: "opencode-go/kimi-k2.5" } } }, null, 2) + "\n",
+      "utf-8",
+    )
+
+    // when
+    const result = detectCurrentConfig()
+
+    // then
+    expect(result.isInstalled).toBe(true)
+    expect(result.hasOpencodeGo).toBe(true)
+  })
 })
 
 describe("addPluginToOpenCodeConfig - dual name detection", () => {