fix: project id forwarding regression (#93)

* fix(proxy): avoid empty project context and hydrate project_id from account token

* test(proxy): add regressions for empty project and token project_id hydration

* test(scripts): add live request validator for project_id forwarding

src/lib/antigravity/ClaudeRequestMapper.ts

@@ -43,7 +43,7 @@ interface RequestConfig {
  */
 export function transformClaudeRequestIn(
   claudeReq: ClaudeRequest,
-  projectId: string,
+  projectId?: string,
 ): GeminiInternalRequest {
   // Check for networking tools (server tool or built-in tool)
   const hasWebSearchTool = detectsNetworkingTool(claudeReq.tools);
@@ -163,8 +163,9 @@ export function transformClaudeRequestIn(
 
   const requestId = `agent-${uuidv4()}`;
 
+  const normalizedProjectId = projectId?.trim();
+
   const body: GeminiInternalRequest = {
-    project: projectId,
     requestId: requestId,
     request: innerRequest as GeminiInternalRequest['request'],
     model: config.finalModel,
@@ -172,6 +173,10 @@ export function transformClaudeRequestIn(
     requestType: config.requestType,
   };
 
+  if (normalizedProjectId) {
+    body.project = normalizedProjectId;
+  }
+
   if (claudeReq.metadata?.user_id) {
     body.sessionId = claudeReq.metadata.user_id;
   }

src/lib/antigravity/types.ts

@@ -269,7 +269,7 @@ export interface GeminiRequest {
 }
 
 export interface GeminiInternalRequest {
-  project: string;
+  project?: string;
   requestId: string;
   request: GeminiRequest;
   model: string;