fix(strix): reject empty GitHub Models endpoint

Author: seonghobae

scripts/ci/strix_quick_gate.sh

@@ -2278,6 +2278,10 @@ resolved_llm_api_base_for_model() {
 	llm_api_base_value="${llm_api_base_value%%:generateContent*}"
 	llm_api_base_value="$(trim_whitespace "$llm_api_base_value")"
 	if [ -z "$llm_api_base_value" ]; then
+		if is_github_models_model "$model"; then
+			echo "ERROR: GitHub Models Strix scans require a non-empty LLM_API_BASE_FILE selecting the pinned GitHub Models inference endpoint." >&2
+			return 2
+		fi
 		return 0
 	fi
 	if [[ "$llm_api_base_value" =~ [[:space:][:cntrl:]] ]]; then

scripts/ci/test_strix_quick_gate.sh

@@ -5773,6 +5773,18 @@ run_filtered_gate_case_if_requested() {
 			"" \
 			"https://attacker.invalid/v1"
 		;;
+	github-models-empty-api-base-file-rejected)
+		run_gate_case "github-models-empty-api-base-file-rejected" \
+			"openai/gpt-5" \
+			"" \
+			"2" \
+			"GitHub Models Strix scans require a non-empty LLM_API_BASE_FILE" \
+			"0" \
+			"" \
+			"" \
+			"openai" \
+			"   "
+		;;
 	notfound-high-log-low-artifact)
 		run_gate_case "notfound-high-log-low-artifact" \
 			"vertex_ai/notfound-high-log-low-primary" \
@@ -11755,6 +11767,17 @@ run_gate_case "github-models-openai-gpt-requires-api-base" \
 	"openai" \
 	""
 
+run_gate_case "github-models-empty-api-base-file-rejected" \
+	"openai/gpt-5" \
+	"" \
+	"2" \
+	"GitHub Models Strix scans require a non-empty LLM_API_BASE_FILE" \
+	"0" \
+	"" \
+	"" \
+	"openai" \
+	"   "
+
 run_gate_case "direct-openai-gpt-does-not-require-github-models-api-base" \
 	"openai_direct/gpt-5.4" \
 	"" \