Drop the "you may know this document as a PRD" hedge from to-spec and
the local tracker template, switch code-review to issue/spec, bring the
GitHub and GitLab tracker templates in line with the local one, and fix
research.md's dead skills-to-prd link.
CHANGELOG and existing changesets keep the old term where they document
the rename itself.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
