* feat: add PR template with risk assessment and review tracks
Add a pull request template that includes summary, change type,
validation checklist, security/database impact sections, blast radius,
and rollback plan. Update CONTRIBUTING.md with review track definitions
(A/B/C) based on change risk level.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* fix: expand CONTRIBUTING.md with setup, workflow, and guidelines
Add getting started, development workflow, code style summary,
database change guidance, and dependency management sections.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
