feat(matplotlib): implement histogram-basic

Implements basic histogram visualization for matplotlib library.
- Uses ax.hist() with 30 bins
- Python Blue color (#306998) with white edgelines
- Proper axis labels and title with appropriate font sizes
- Grid lines on y-axis for readability
- Output: 4800x2700 px image at 300 DPI

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)
+plt.savefig("plot.png", dpi=300, bbox_inches="tight")