add SKILL

.github/PULL_REQUEST_TEMPLATE.md

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+## What changed and why
+
+<!-- Brief description of the changes and motivation -->
+
+## Type of change
+
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Refactoring (no functional changes)
+- [ ] Documentation update
+- [ ] Configuration / CI change
+
+## Checklist
+
+- [ ] Code follows project conventions (`RULES.md`)
+- [ ] Relevant documentation updated (`docs/`, `DOCS.md`)
+- [ ] Tests added/updated (if applicable)
+- [ ] No secrets or credentials in the diff
+- [ ] Breaking changes described below (if any)
+
+## Breaking Changes
+
+<!-- List any breaking changes, or write "None" -->
+
+None
+
+## Related Issues
+
+<!-- Link related issues: Fixes #123, Relates to #456 -->