Update version PR default preamble and add HR before package list

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: theoephraim

packages/bumpy/src/commands/ci.ts

@@ -237,6 +237,8 @@ function formatVersionPrBody(plan: ReleasePlan, preamble: string): string {
   const lines: string[] = [];
   lines.push(preamble);
   lines.push('');
+  lines.push('---');
+  lines.push('');
 
   for (const r of plan.releases) {
     const suffix = r.isDependencyBump ? ' (dep)' : r.isCascadeBump ? ' (cascade)' : '';

packages/bumpy/src/types.ts

@@ -139,7 +139,7 @@ export const DEFAULT_CONFIG: BumpyConfig = {
     title: '🐸 Versioned release',
     branch: 'bumpy/version-packages',
     preamble:
-      "This PR was opened by [bumpy](https://github.com/dmno-dev/bumpy). When you're ready to do a release, you can merge this and the packages will be published. If you're not ready to do a release yet, that's fine — whenever you add more changesets to main, this PR will be updated.",
+      'Merge this PR to publish the listed packages. This PR will be automatically updated as new changesets are added to main.',
   },
 };