fix: update Graphite links from graphite.dev to graphite.com

[jd]

The graphite.dev domain now returns 301 redirects to graphite.com,
causing broken link detection to flag these as 404s.

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[mergify]

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    • label = ignore-broken-links
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[jd]

This pull request is part of a stack:

1. fix: update Graphite links from graphite.dev to graphite.com (#10371) 👈
2. fix: use correct Graphite getting started URL (#10372)