* docs: enhance PR guidelines and template
* docs: refine contribution guidelines and issue templates
Clarify when to open an issue first, what can go straight to a PR,
and align CONTRIBUTING with the PR template without duplicating checklists.
Co-authored-by: Cursor <cursoragent@cursor.com>
* chore: update doc
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Co-authored-by: Cursor <cursoragent@cursor.com>