fix: update AGENTS.md formatting

[nieblara]

Noop change to trigger release-please for v3.0.1.

Note: release-please is currently regressing to 0.12.x because the release-type is go and the module path lacks a /v3 suffix. The missing v3.0.0 git tag may also need to be created on commit caa1fd2 for release-please to compute the correct next version.

Made with Cursor

---

Note

Low Risk
Documentation-only change with no impact on runtime behavior or build/test logic.

Overview
Adjusts AGENTS.md formatting by inserting an extra blank line in the Dev Server Frontend shell snippet (inside the fenced code block). No functional code changes.

^{Reviewed by Cursor Bugbot for commit 362f5da. Bugbot is set up for automated code reviews on this repo. Configure here.}