feat(opencode-go): add provider type and availability detection

src/cli/model-fallback-types.ts

@@ -8,6 +8,7 @@ export interface ProviderAvailability {
 	copilot: boolean
 	zai: boolean
 kimiForCoding: boolean
+	opencodeGo: boolean
 	isMaxPlan: boolean
 }
 

src/cli/provider-availability.ts

@@ -12,6 +12,7 @@ export function toProviderAvailability(config: InstallConfig): ProviderAvailabil
 		copilot: config.hasCopilot,
 		zai: config.hasZaiCodingPlan,
 kimiForCoding: config.hasKimiForCoding,
+		opencodeGo: config.hasOpencodeGo,
 		isMaxPlan: config.isMax20,
 	}
 }
@@ -25,6 +26,7 @@ export function isProviderAvailable(provider: string, availability: ProviderAvai
 		opencode: availability.opencodeZen,
 		"zai-coding-plan": availability.zai,
 "kimi-for-coding": availability.kimiForCoding,
+		"opencode-go": availability.opencodeGo,
 	}
 	return mapping[provider] ?? false
 }

src/cli/types.ts

@@ -10,6 +10,7 @@ export interface InstallArgs {
   opencodeZen?: BooleanArg
   zaiCodingPlan?: BooleanArg
 kimiForCoding?: BooleanArg
+  opencodeGo?: BooleanArg
   skipAuth?: boolean
 }
 
@@ -22,6 +23,7 @@ export interface InstallConfig {
   hasOpencodeZen: boolean
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
+  hasOpencodeGo: boolean
 }
 
 export interface ConfigMergeResult {
@@ -40,4 +42,5 @@ export interface DetectedConfig {
   hasOpencodeZen: boolean
   hasZaiCodingPlan: boolean
   hasKimiForCoding: boolean
+  hasOpencodeGo: boolean
 }