* feat: add skill-creator custom agent for GitHub Copilot
Adds a specialized agent that creates complete SDK skill bundles from
scratch. Key differentiator: it clones the SDK repo locally to verify
every API name, config option, and import path against actual source
code before writing anything.
Workflow: study existing skills -> research docs -> clone SDK repo ->
verify APIs against source -> write skill bundle -> run quality
checklist -> register in skill tree -> open PR.
References skill-creator files (philosophy.md, quality-checklist.md,
research-playbook.md) as source of truth rather than duplicating them.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: run skill tree registration before validation
Swaps Steps 6 and 7 so the new skill is registered in the parent
router table before build-skill-tree.sh runs. The validator checks
that every skill with a parent field appears in its router — running
it before registration always fails.
Also switches to --check flag for the final validation to prevent
unintended SKILL_TREE.md modifications during verification.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Daniel Griesser