Art skill uses lowercase naming, violates SkillSystem.md TitleCase convention

[hjbrandt]

Issue

The Art skill uses lowercase directory and file naming, which contradicts the TitleCase convention specified in SkillSystem.md.

SkillSystem.md states:

"All naming in the skill system MUST use TitleCase (PascalCase)."

Current Art skill structure (non-compliant):

.claude/Skills/Art/
├── tools/                    # Should be: Tools/
├── workflows/                # Should be: Workflows/
│   ├── workflow.md          # Should be: Workflow.md
│   ├── visualize.md         # Should be: Visualize.md
│   ├── mermaid.md           # Should be: Mermaid.md
│   ├── technical-diagrams.md # Should be: TechnicalDiagrams.md
│   ├── annotated-screenshots.md # Should be: AnnotatedScreenshots.md
│   └── ... (other lowercase/hyphenated files)
└── SKILL.md

Path references in SKILL.md:

The file references Skills/art/tools/generate-ulart-image.ts - should be Skills/Art/tools/... (or Skills/Art/Tools/... for full compliance).

Suggested fix:

1. Rename workflows/ → Workflows/
2. Rename tools/ → Tools/
3. Rename all workflow files to TitleCase (e.g., technical-diagrams.md → TechnicalDiagrams.md)
4. Update path references in SKILL.md

This aligns with other skills that follow the TitleCase convention.