<!-- SPDX-License-Identifier: MIT -->
<!-- SPDX-FileCopyrightText: 2025-2026 Marcus Quinn -->

# t1521: Multi-channel conversation continuity — entity-aware email threading

## Origin

- **Created:** 2026-03-16
- **Session:** opencode:email-system-planning
- **Created by:** human + ai-interactive
- **Parent task:** none (Phase 4 polish)

## What

Extend entity-helper.sh to link email conversations to entity profiles, enabling conversation continuity across email and messenger apps. Create guidance doc for cross-channel conversation patterns.

## Acceptance Criteria

- [ ] Entity resolution works for email addresses (link to existing entity profiles)
- [ ] Cross-channel guidance doc exists

## Dependencies

- **Blocked by:** t1493 (mailbox helper), existing entity-helper.sh
- **External:** Entity system must be operational

## Estimate Breakdown

| Phase | Time | Notes |
|-------|------|-------|
| Implementation | 3h | Entity integration + guidance doc |
| **Total** | **3h** | |
