feat: complete rebranding to Gemini Nexus with improved UI, proxies and documentation

src/lib/geminiNexus/ClaudeRequestMapper.ts

@@ -397,11 +397,11 @@ function buildSystemInstruction(
   system: ClaudeRequest['system'],
 ): { parts: { text: string }[] } | null {
   const assistantIdentityDirective =
-    'You are Antigravity, a powerful agentic AI coding assistant designed by the Google Deepmind team working on Advanced Agentic Coding.\n' +
+    'You are Gemini Nexus, a powerful agentic AI coding assistant designed by the Google Deepmind team working on Advanced Agentic Coding.\n' +
     'You are pair programming with a USER to solve their coding task. The task may require creating a new codebase, modifying or debugging an existing codebase, or simply answering a question.\n' +
     '**Absolute paths only**\n' +
     '**Proactiveness**';
-  const identityMarker = 'You are Antigravity';
+  const identityMarker = 'You are Gemini Nexus';
 
   const parts: { text: string }[] = [];
 

src/lib/geminiNexus/ModelMapping.ts

@@ -81,7 +81,7 @@ const DYNAMIC_MODEL_FORWARDING_RULES = new Map<string, string>();
 
 export const MODEL_LIST_CREATED_AT = 1770652800;
 
-export const MODEL_LIST_OWNER = 'antigravity';
+export const MODEL_LIST_OWNER = 'geminiNexus';
 
 const GEMINI_MODEL_ALIASES: Record<string, string> = {
   'gemini-3-pro-image-preview': 'gemini-3-pro-image',

src/lib/geminiNexus/QuotaService.ts

@@ -10,7 +10,7 @@ const QUOTA_API_ENDPOINTS = [
   'https://cloudcode-pa.googleapis.com/v1internal:fetchAvailableModels',
 ] as const;
 const CLOUD_CODE_BASE_URL = 'https://cloudcode-pa.googleapis.com';
-const USER_AGENT = 'antigravity/1.11.3 Darwin/arm64'; // Keeping the same UA as source
+const USER_AGENT = 'geminiNexus/1.11.3 Darwin/arm64'; // Keeping the same UA as source
 
 // Service Class
 export class QuotaService {
@@ -41,7 +41,7 @@ export class QuotaService {
         {
           headers: {
             Authorization: `Bearer ${accessToken}`,
-            'User-Agent': 'antigravity/windows/amd64',
+            'User-Agent': 'geminiNexus/windows/amd64',
           },
         },
       );