README: Inconsistent python3 vs python in Windows non-WSL setup

[tim-schilling]

Location

README.md, Windows non-WSL Setup section (lines 144-182)

Issue

Step 1 uses python3 -m venv venv but all subsequent steps use python -m manage .... This inconsistency could confuse beginners who may not realize these should be the same Python installation.

Suggested fix

Either:

1. Use python consistently throughout (matching the MacOS/Linux section), or
2. Use python3 consistently throughout the Windows non-WSL section

Option 1 is recommended for consistency with the rest of the document.