chore: import GEMINI_FLASH_LITE in evaluate_search_quality

Address Greptile review nit. DEFAULT_JUDGE_MODEL now reuses the
constant from lib/providers.py instead of duplicating the literal,
so a future identifier change only needs one edit.

skills/last30days/scripts/evaluate_search_quality.py

@@ -20,6 +20,7 @@ sys.path.insert(0, str(Path(__file__).parent))
 
 from lib import env as envlib
 from lib import schema
+from lib.providers import GEMINI_FLASH_LITE
 
 
 SKILL_ROOT = Path(__file__).resolve().parents[1]
@@ -43,7 +44,7 @@ def _load_default_topics() -> list[tuple[str, str]]:
 
 DEFAULT_TOPICS = _load_default_topics()
 DEFAULT_SEARCH = ""
-DEFAULT_JUDGE_MODEL = "gemini-3.1-flash-lite"
+DEFAULT_JUDGE_MODEL = GEMINI_FLASH_LITE
 GEMINI_API_URL = "https://generativelanguage.googleapis.com/v1beta/models/{model}:generateContent?key={api_key}"