Deliver newsletter, platform updates, and governance feeds

## Outcome

Users can subscribe to and consume trustworthy GovTool updates and contextual governance feeds.

## Scope

- Define feed taxonomy, editorial ownership, and delivery channels
- Define subscription, consent, preference, and unsubscribe behavior
- Integrate governance events and platform updates
- Add reliability, moderation, privacy, and analytics requirements

## Acceptance criteria

- [ ] Scope is decomposed into independently deliverable child issues.
- [ ] Architecture and API decisions are linked from this issue.
- [ ] Test, documentation, observability, rollout, and failure behavior are defined where applicable.
- [ ] Epic exit criteria are verified before closure.

## Planning note

This is a 2026 GovTool revamp work item. Its child features and tasks should be added as the scope is refined.

Start by decomposing the feed taxonomy, editorial ownership, delivery channels, subscription and consent behavior, governance integration, and reliability requirements into independently deliverable child issues. Define and link the architecture and API decisions, then establish test, documentation, observability, rollout, and failure criteria before implementation.

Written by the indexing model from the issue text.