* chore: add Claude Code skills for PR descriptions and release notes
* chore(skills): update release-notes branches to canary->master and example version to v1.3.0
* chore(skills): address PR review comments
- pr-description: infer base branch from PR metadata, fix Improvement wording, reference template's screenshot placeholder verbatim
- release-notes: add `text` language to unlabeled fenced code block
sriram veeraghanta
f1d567accc