Merge community PRs: Windows Unicode fix, 403 fallback, --days flag

- PR #17 (JosephOIbrahim): Fix UnicodeEncodeError on Windows cp1252
- PR #16 (levineam): Handle HTTP 403 model access errors, add gpt-4.1 fallback
- PR #18 (jonthebeef): Add --days=N flag for configurable lookback (1-30)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/lib/models.py

@@ -7,7 +7,7 @@ from . import cache, http
 
 # OpenAI API
 OPENAI_MODELS_URL = "https://api.openai.com/v1/models"
-OPENAI_FALLBACK_MODELS = ["gpt-5.2", "gpt-5.1", "gpt-5", "gpt-4o"]
+OPENAI_FALLBACK_MODELS = ["gpt-5.2", "gpt-5.1", "gpt-5", "gpt-4.1", "gpt-4o"]
 
 # xAI API - Agent Tools API requires grok-4 family
 XAI_MODELS_URL = "https://api.x.ai/v1/models"
@@ -35,8 +35,8 @@ def is_mainline_openai_model(model_id: str) -> bool:
     """Check if model is a mainline GPT model (not mini/nano/chat/codex/pro)."""
     model_lower = model_id.lower()
 
-    # Must be gpt-5 series
-    if not re.match(r'^gpt-5(\.\d+)*$', model_lower):
+    # Must be gpt-4o, gpt-4.1+, or gpt-5+ series (mainline, not mini/nano/etc)
+    if not re.match(r'^gpt-(?:4o|4\.1|5)(\.\d+)*$', model_lower):
         return False
 
     # Exclude variants