Why your monorepo's per-package Claude Code skill says 'Unknown skill': it loaded after a Read in that folder, not after a cat (Opus 5.5 and Sonnet 5.5)

0 of 2 runs that read packages/api/src/index.ts with cat through Bash loaded the skill in packages/api/.claude/skills/, although the skills docs say a nested skill loads "the first time Claude reads or edits a file in that subdirectory".