refine(skills): openfeature-eng - fix naming (2 segments, missing category)

[aRustyDev]

Summary

openfeature-eng has only 2 segments, missing the expected category structure.

Current Name Analysis

• Name: openfeature-eng
• Segments: 2 (openfeature, eng)
• Focus: eng ✓ (valid)
• Issue: Missing category prefix

Refinement Checklist

• Determine appropriate category for this skill
• Option A: Rename to tool-openfeature-eng (3 segments)
• Option B: Rename to observability-openfeature-eng (3 segments)
• Option C: Rename to feature-flags-openfeature-eng (4 segments)
• If renaming, update skill directory name
• If renaming, update SKILL.md frontmatter
• Run just validate-skill components/skills/<new-name> to verify
• Update any references to this skill in other files

Validation Command

just validate-skill components/skills/openfeature-eng