fix: upgrade startup script controls

docs/CHANGELOG.md

@@ -7,6 +7,30 @@ This project follows the repository versioning rule:
 - `feature` -> `+0.1.0`
 - `bugfix` -> `+0.0.1`
 
+## 0.21.3
+
+Released: 2026-03-27
+
+### Highlights
+
+- Upgraded the startup script into a more resilient local control entrypoint with retry-based service boot, selective restart targeting, and guided CLI user creation.
+- Reduced friction when developing across slower machines by making backend and frontend startup checks more tolerant and operator-friendly.
+
+### Added
+
+- Added interactive `createuser` support to [planet.sh](/home/ray/dev/linkong/planet/planet.sh) for CLI-driven username, email, password, and admin-role creation.
+
+### Improved
+
+- Improved `start` and `restart` in [planet.sh](/home/ray/dev/linkong/planet/planet.sh) with optional backend/frontend port targeting and on-demand port cleanup.
+- Improved startup robustness with repeated health checks and automatic retry loops for both backend and frontend services.
+- Improved restart ergonomics so `restart -b` and `restart -f` can restart only the requested service instead of forcing a full stack restart.
+
+### Fixed
+
+- Fixed false startup failures on slower environments where services needed longer than a single fixed wait window to become healthy.
+- Fixed first-run login dead-end by ensuring a default admin user is created during backend initialization when the database has no users.
+
 ## 0.21.2
 
 Released: 2026-03-26