chore: update model catalog with gemma 4, opus distill, and hw-bandwidth target

Makefile

@@ -45,6 +45,10 @@ serve: ## Launch llama-server with optimized settings (ARGS="-m MODEL.gguf")
 serve-ngram: ## Launch with n-gram speculative decoding (ARGS="-m MODEL.gguf")
 	@bash bin/serve --ngram $(ARGS)
 
+# --- Hardware Info ---
+hw-bandwidth: ## Measure GPU memory bandwidth and compute (clpeak)
+	@clpeak 2>&1
+
 # --- Optimize ---
 optimize: ## Interactive optimization walkthrough
 	@bash bin/optimize --all