Use relative duration for uv exclude-newer instead of hardcoded date

Changes "2026-03-25T00:00:00Z" to "7d" so it always resolves to
7 days ago from the current time.

https://claude.ai/code/session_01LXQH3dzc39q98gtVZ4TJuc

Author: claude

pyproject.toml

@@ -65,7 +65,7 @@ select = ["E", "F", "I", "N"]
 ignore = []
 
 [tool.uv]
-exclude-newer = "2026-03-25T00:00:00Z"
+exclude-newer = "7d"
 
 [tool.ruff.mccabe]
 max-complexity = 10