- Add maxBodyBytes constant (1 << 20 = 1 MB)
- Add errors import to production file
- Apply http.MaxBytesReader + errors.As(err, *http.MaxBytesError) pattern in:
WebhookHandler, TagsHandler POST, TagAssignmentHandler PUT and DELETE
- Return HTTP 413 RequestEntityTooLarge when body exceeds limit
- Fix oversized body test strategy: use JSON prefix so decoder reads past limit
(Rule 1 deviation: all-x body fails at byte 1 before MaxBytesReader triggers)