docs(commits): require explicit reviewer requests on PR creation

Adds step 7 to the Review-and-Publish PR-description flow: pass
--reviewer at create time or use gh pr edit --add-reviewer right
after. Notes that CODEOWNERS auto-suggestions aren't requests, that
picking reviewers should follow the team's per-repo convention, and
that follow-up PRs benefit from tagging the parent PR's author.
Renumbers the Linear-comment and Dev-Review status steps accordingly.

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