Adds technique-oriented Compose and Kotlin skills from chrisbanes/skills
to complement the existing codebase-oriented skills. Codebase skills cover
"where is X in Amethyst"; these cover "what is the correct Compose/Kotlin
design". Descriptions tagged as technique-layer and cross-links trimmed to
the vendored subset. CLAUDE.md skill table updated with a dedicated section.
https://claude.ai/code/session_01QE8CjoJXUt7RKtwGgzeMrb
Claude