feat(cli/buildx): add pull control for builds and isolate buildx builders per project

ts/interfaces/index.ts

@@ -69,6 +69,7 @@ export interface IBuildCommandOptions {
   platform?: string;    // Single platform override (e.g., 'linux/arm64')
   timeout?: number;     // Build timeout in seconds
   noCache?: boolean;    // Force rebuild without Docker layer cache (--no-cache)
+  pull?: boolean;       // Pull fresh base images before building (default: true)
   cached?: boolean;     // Skip builds when Dockerfile content hasn't changed
   verbose?: boolean;    // Stream raw docker build output (default: silent)
   context?: string;      // Explicit Docker context name (--context flag)