feat(matplotlib): implement histogram-basic

Implements basic histogram visualization for matplotlib library.

- Uses ax.hist() with 30 bins
- Follows style guide: 4800x2700px, Python Blue color
- Proper labels, title, and grid styling

Author: github-actions[bot]

plots/matplotlib/hist/histogram-basic/default.py

@@ -24,4 +24,4 @@
 ax.grid(True, alpha=0.3, axis="y")
 
 plt.tight_layout()
-plt.savefig("plot.png", dpi=300, bbox_inches="tight")
+plt.savefig("plot.png", dpi=300)