docs: add Phase 6 — Web Chat interface for AI Employees

.planning/REQUIREMENTS.md

@@ -64,6 +64,14 @@ Requirements for beta-ready release. Each maps to roadmap phases.
 - [x] **EMPL-04**: Wizard and templates accessible to platform admins and customer admins (RBAC-enforced, not operators)
 - [x] **EMPL-05**: Agents created via wizard or template appear in Agent Designer for further customization
 
+### Web Chat
+
+- [ ] **CHAT-01**: Users can open a chat window with any AI Employee and have a real-time conversation within the portal
+- [ ] **CHAT-02**: Web chat supports the full agent pipeline — memory, tools, escalation, and media (same capabilities as Slack/WhatsApp)
+- [ ] **CHAT-03**: Conversation history persists and is visible when the user returns to the chat
+- [ ] **CHAT-04**: Chat respects RBAC — users can only chat with agents belonging to tenants they have access to
+- [ ] **CHAT-05**: Chat interface feels responsive — typing indicators, message streaming or fast response display
+
 ## v2 Requirements
 
 Deferred to future release. Tracked but not in current roadmap.
@@ -148,11 +156,17 @@ Which phases cover which requirements. Updated during roadmap creation.
 | EMPL-03 | Phase 5 | Complete |
 | EMPL-04 | Phase 5 | Complete |
 | EMPL-05 | Phase 5 | Complete |
+| CHAT-01 | Phase 6 | Pending |
+| CHAT-02 | Phase 6 | Pending |
+| CHAT-03 | Phase 6 | Pending |
+| CHAT-04 | Phase 6 | Pending |
+| CHAT-05 | Phase 6 | Pending |
 
 **Coverage:**
 - v1 requirements: 25 total (all complete)
 - RBAC requirements: 6 total (Phase 4, all complete)
-- Employee Design requirements: 5 total (Phase 5)
+- Employee Design requirements: 5 total (Phase 5, all complete)
+- Web Chat requirements: 5 total (Phase 6)
 
 ---
 *Requirements defined: 2026-03-23*