Allow users to configure external notification delivery (Slack, email, webhook) at the project level. References: PRD §6.4 ## Acceptance Criteria - [ ] Configurable per project (not globally) - [ ] Supported channels: Slack, email, webhook - [ ] Different channel configs for prod vs dev environments - [ ] All external channels opt-in only
Allow users to configure external notification delivery (Slack, email, webhook) at the project level.
References: PRD §6.4
Acceptance Criteria