🤖 Fix remaining startup delay: Don't load AIService for git status checks

Critical fix: The WORKSPACE_EXECUTE_BASH IPC handler was calling
this.aiService.getWorkspaceMetadata() just to get the workspace path.
This triggered lazy-load of AIService on first git status check,
importing the massive AI SDK (~3s) and blocking all IPC calls.

Solution: Use Config.findWorkspace() instead, which already returns
both workspacePath and projectPath without needing AIService.

Impact:
- Git status checks no longer trigger AI SDK import
- AI SDK only loads when first AI stream starts (actual use)
- Eliminates the 3s pause user reported seeing before git status icons appear
- Window appears instantly and is fully interactive immediately

Author: ammar-agent

src/services/ipcMain.ts

@@ -664,19 +664,14 @@ export class IpcMain {
         }
       ) => {
         try {
-          // Get workspace metadata to find workspacePath
-          const metadataResult = await this.aiService.getWorkspaceMetadata(workspaceId);
-          if (!metadataResult.success) {
-            return Err(`Failed to get workspace metadata: ${metadataResult.error}`);
+          // Get workspace path and project path from config (no need for AIService)
+          const workspaceInfo = this.config.findWorkspace(workspaceId);
+          if (!workspaceInfo) {
+            return Err(`Workspace not found: ${workspaceId}`);
           }
 
-          const workspacePath = metadataResult.data.workspacePath;
-
-          // Find project path for this workspace to load secrets
-          const workspaceInfo = this.config.findWorkspace(workspaceId);
-          const projectSecrets = workspaceInfo
-            ? this.config.getProjectSecrets(workspaceInfo.projectPath)
-            : [];
+          const { workspacePath, projectPath } = workspaceInfo;
+          const projectSecrets = this.config.getProjectSecrets(projectPath);
 
           // Create scoped temp directory for this IPC call
           using tempDir = new DisposableTempDir("cmux-ipc-bash");