Lesson 1 — Start here: how this course works, using AI honestly, and where you are starting
Unit I · Substrate and mechanism

L01_diagnostic.txt                           student     Ten-minute self-diagnostic (No AI, not graded).
L01_setup_check.py                           student     Checks Python version and file access; prints PASS/FAIL per check.

Python 3.11 or newer. Standard library only. Run each program from the folder the lesson tells you to put it in:
    python <file>.py        (Windows)
    python3 <file>.py       (macOS and Linux)
