Add curated logo/brand-mark reconstruction case

[swernerx]

Goal

Add a curated logo / brand-mark case that stresses clean curves, symmetry, negative space, and editability.

Why this matters

Logo vectorization is one of the most familiar reasons people reach for Illustrator Image Trace, Vectorizer.AI, Potrace, or similar tools. A Morphēa logo case would make the product story easier to understand: the output should not just look like the logo, it should be made of shapes a designer can repair and reuse.

Example case requirements

• Use a local source image with safe licensing, ideally a synthetic or internal mark created for the suite.
• Include negative space, at least one curved primitive, and at least one sharp or straight-edged form.
• Include mild antialiasing or compression artifacts to avoid an unrealistically perfect fixture.
• Keep color count small enough that geometry quality is the main challenge.

Acceptance criteria

• Add a curated suite entry with a family such as logo_brand_mark.
• Define contracts for curve quality, symmetry, negative-space handling, node/parameter budget, and visual round-trip error.
• Add a before/after report artifact suitable for future README or gallery use.
• Existing curated cases remain green.
• If comparison against Potrace or another tracer is added later, keep it factual and artifact-based.

Notes

This should be a strong candidate for a public example gallery once the output is good enough. Avoid third-party trademarked logos unless licensing is explicit.