fix: address review feedback for Vercel AI Gateway PR

- Add --vercel-ai-gateway CLI option to install command
- Fix librarian/explore priority: native providers (ZAI, Copilot) now take precedence over Vercel gateway
- Add hasVercelAiGateway to installer no-provider warning conditions
- Add hasVercelAiGateway: false to all test file InstallConfig fixtures
- Fix test expectations for model ID format (claude-opus-4.6 vs claude-opus-4-6)

src/cli/cli-program.ts

@@ -33,6 +33,7 @@ program
   .option("--zai-coding-plan <value>", "Z.ai Coding Plan subscription: no, yes (default: no)")
   .option("--kimi-for-coding <value>", "Kimi For Coding subscription: no, yes (default: no)")
   .option("--opencode-go <value>", "OpenCode Go subscription: no, yes (default: no)")
+  .option("--vercel-ai-gateway <value>", "Vercel AI Gateway: no, yes (default: no)")
   .option("--skip-auth", "Skip authentication setup hints")
   .addHelpText("after", `
 Examples:
@@ -40,14 +41,15 @@ Examples:
   $ bunx oh-my-opencode install --no-tui --claude=max20 --openai=yes --gemini=yes --copilot=no
   $ bunx oh-my-opencode install --no-tui --claude=no --gemini=no --copilot=yes --opencode-zen=yes
 
-Model Providers (Priority: Native > Copilot > OpenCode Zen > Z.ai > Kimi):
+Model Providers (Priority: Native > Copilot > OpenCode Zen > Z.ai > Kimi > Vercel):
   Claude        Native anthropic/ models (Opus, Sonnet, Haiku)
   OpenAI        Native openai/ models (GPT-5.4 for Oracle)
   Gemini        Native google/ models (Gemini 3.1 Pro, Flash)
   Copilot       github-copilot/ models (fallback)
   OpenCode Zen  opencode/ models (opencode/claude-opus-4-6, etc.)
-   Z.ai          zai-coding-plan/glm-5 (visual-engineering fallback)
+  Z.ai          zai-coding-plan/glm-5 (visual-engineering fallback)
   Kimi          kimi-for-coding/k2p5 (Sisyphus/Prometheus fallback)
+  Vercel        vercel/ models (universal proxy, always last fallback)
 `)
   .action(async (options) => {
     const args: InstallArgs = {
@@ -60,6 +62,7 @@ Model Providers (Priority: Native > Copilot > OpenCode Zen > Z.ai > Kimi):
       zaiCodingPlan: options.zaiCodingPlan,
       kimiForCoding: options.kimiForCoding,
       opencodeGo: options.opencodeGo,
+      vercelAiGateway: options.vercelAiGateway,
       skipAuth: options.skipAuth ?? false,
     }
     const exitCode = await install(args)