--- Pr to migrate system prompt: [Prompt registry] Phase 3 — Cutover: route default path through the registry • Note that the system prompt has changed. Specifically, excess blank spaces between sections have now been standardized to just a single blank space between any two sections • if this PR is accepted. There are still a couple of follow-up PRs needed to completely clean up the old structure. cc: @millions-crayon-32880 @calm-artist-7206