Accept GOOGLE_API_KEY for local Gemini eval

This workspace uses GOOGLE_API_KEY as the canonical Google credential. Accept it ahead of the Gemini-specific aliases so the local evaluation harness can run without a separate GEMINI_API_KEY export.

Validation: uv run python -m unittest tests.test_env_project tests.test_evaluate_search_quality and a one-shot keychain-backed resolution check.

scripts/lib/env.py

@@ -243,7 +243,9 @@ def get_config() -> Dict[str, Any]:
 
     keys = [
         ('XAI_API_KEY', None),
+        ('GOOGLE_API_KEY', None),
         ('GEMINI_API_KEY', None),
+        ('GOOGLE_GENAI_API_KEY', None),
         ('OPENROUTER_API_KEY', None),
         ('PARALLEL_API_KEY', None),
         ('BRAVE_API_KEY', None),