fix: Invalidate oauth credentials when oauth provider says so (anomalyco#14007)

Co-authored-by: Eduardo Gomes <egomes@cloudflare.com>

Author: GreenStage

packages/opencode/src/mcp/oauth-provider.ts

@@ -149,6 +149,28 @@ export class McpOAuthProvider implements OAuthClientProvider {
     }
     return entry.oauthState
   }
+
+  async invalidateCredentials(type: "all" | "client" | "tokens"): Promise<void> {
+    log.info("invalidating credentials", { mcpName: this.mcpName, type })
+    const entry = await McpAuth.get(this.mcpName)
+    if (!entry) {
+      return
+    }
+
+    switch (type) {
+      case "all":
+        await McpAuth.remove(this.mcpName)
+        break
+      case "client":
+        delete entry.clientInfo
+        await McpAuth.set(this.mcpName, entry)
+        break
+      case "tokens":
+        delete entry.tokens
+        await McpAuth.set(this.mcpName, entry)
+        break
+    }
+  }
 }
 
 export { OAUTH_CALLBACK_PORT, OAUTH_CALLBACK_PATH }