Pedagogy: move 00_introduction/35_numpy_matplotlib → 06_python_advanced/{60_numpy_basics, 70_matplotlib_basics}

[kwlee2025cpp]

Goal

00_introduction/35_numpy_matplotlib.ipynb is solid focused content but combines two libraries. With the 00_introduction restructure (motivation only), libraries move to 06_python_advanced. Splitting numpy and matplotlib into separate notebooks at the same time gives each library room to grow exercises and explanation.

Scope

Create:

• 06_python_advanced/60_numpy_basics.ipynb — np.array, np.linspace, np.zeros/ones, element-wise vs list ops, indexing/slicing, reshape, broadcasting introduction
• 06_python_advanced/70_matplotlib_basics.ipynb — plt.subplots, line/scatter, labels/legends/styles, fig+ax pattern, common gotchas

Retire 00_introduction/35_numpy_matplotlib.ipynb after split.

Why

• Two libraries → two notebooks; matches 03_python_basics granularity.
• Lets numpy basics include broadcasting (currently absent in 35) without bloating one file.
• Both are heavily referenced from chapters 10+; needs to be findable as standalone topics.

Acceptance

• Both new notebooks exist and run end-to-end.
• Each has at least 2 exercises (matching the original's pattern).
• Modern matplotlib API (no pylab; per Maintenance: migrate pylab → matplotlib.pyplot + numpy across notebooks (33 files) #390).
• Old 35_numpy_matplotlib.ipynb removed.