Add Hough Transform illustration

[kiro-agent]

This pull request was created by @kiro-agent on behalf of @VanOschB 👻

Comment with /kiro fix to address specific feedback or /kiro all to address everything.
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Summary

• Adds a clean 1200×650 two-panel Hough Transform illustration as a PNG.
• Adds the editable SVG source.
• Maps three straight lines and sampled pixels in image space to sinusoidal votes and accumulator peaks in (θ, ρ) parameter space.

Verification

• Visually inspected the rendered PNG against the established figure style.
• Confirmed nine pixel-vote curves and three color-matched line peaks.
• Confirmed all sampled points satisfy their corresponding line parameters: A=(60°, 6.5), B=(−60°, −2), and C=(0°, 7).
• Confirmed PNG dimensions and matching SVG viewBox.

Limitations

• None.