Cerasus task board for Claude Duet.

GET /duet/<token>  or  GET /<token> — JSON task list
GET ...?format=html — HTML table
GET ...?action=update&taskId=T-xxx&owner=...&status=...&due=...&nextStep=...
GET ...?action=note&taskId=T-xxx&text=...
GET ...?action=add&title=...&owner=...&due=...
POST /duet/<token>/add|update|reply|note with JSON body also works.
No delete. Token required. No cookies or browser needed.