docs: document planned release workflow

Author: lavr

AGENTS.md

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+# Repository Guidelines
+
+## Releases
+
+- Perform planned releases only through `./release.sh` from the `main` branch.
+- Run `./release.sh status` before releasing, then use the appropriate command:
+  `./release.sh app`, `./release.sh chart`, or `./release.sh both`.
+- Manual releases, including manual tag creation or pushing, are allowed only in
+  exceptional cases when the standard script is unsuitable. Document the reason
+  for bypassing `release.sh` and verify the resulting versions and tags.