Update CLAUDE.md + architecture.md stack to Grav 2.0.4 stable, admin2 2.0.10, gpm.releases: stable, and the three-category plugin-management model (GPM-managed / custom-in-repo / remote-only git-sync). Add execution outcome, Phase 3 prod fresh-install runbook (documentation-only), and mark plan Status complete. Note the Form 9.1.10 filepond regression as a known issue owned by the separate form-to-page rework. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Np4cMQLF77i664CAQXySzU