chore: align pyright pythonVersion with requires-python floor

Address Greptile P2: pyright was still targeting 3.12 while the runtime
floor was lowered to 3.11. Aligning so CI type-checks against 3.11
semantics — catches 3.11-vs-3.12 stdlib/overload drift that would
otherwise slip through.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: max-parke-scale

pyproject.toml

@@ -193,7 +193,7 @@ filterwarnings = [
 [tool.pyright]
 # Default to basic type checking, but override for specific directories
 typeCheckingMode = "basic"
-pythonVersion = "3.12"
+pythonVersion = "3.11"
 
 exclude = [
     "_dev",