docs: update AGENTS-BOT.md and README.md with Stopwatch features & guidelines

AGENTS-BOT.md

@@ -157,3 +157,4 @@ if (process.env.AUTO_DEPLOY !== 'false') {
 10. **Role Menu Error Handling:** Always wrap `member.roles.add` and `member.roles.remove` in `try/catch` blocks in interaction listeners to handle permission/hierarchy errors gracefully.
 11. **Select Menu Emoji Handling:** Never pass an empty string `''` to `setEmoji()`. Only call `setEmoji()` when a valid, non-empty emoji string is provided.
 12. **Team Application Owner Support:** When checking bot owner status, check `process.env.BOT_OWNER_ID` or test if `client.application.owner` is a `Team` object with `owner.members.has(userId)`.
+13. **Stopwatch Duplicate Prevention & Custom Start Time:** When creating stopwatches, perform a case-insensitive name uniqueness check per user/guild (`LOWER(name)`). Validate custom start times (`startzeit`) to ensure they do not lie in the future.

README.md

@@ -157,5 +157,6 @@ npm run deploy
 - ✅ **Role Selection:** Self-Service Rollen-System über Discord Select Menus mit automatischer Berechtigungsprüfung und Fehlerabfangung.
 - ✅ **Smart Auto-Response System:** Präzises Trigger-Wort-Matching mit Wortgrenzen-Regex (`\b`), um Falsch-Positive zu vermeiden.
 - ✅ **Reminders:** Intelligentes Zeit-Parsing (z.B. "morgen 15:00", "30min").
+- ✅ **Persistent Stopwatches:** Namentliche hochzählende Stoppuhren mit SQLite-Speicherung, Unterstützung für optionale vergangene Startzeiten (z.B. "14:30", "2h"), Duplikat-Schutz und relativer Discord-Zeitdarstellung.
 - ✅ **Developer & Team Support:** Unterstützung von Discord Developer Teams und `BOT_OWNER_ID` Fallback für Owner-Befehle.
 - ✅ **Docker Support:** Containerisiertes Deployment inklusive Volume-Mounts für Daten.