docs(06-01): complete web chat backend infrastructure plan

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: completed
-stopped_at: Phase 6 context gathered
-last_updated: "2026-03-25T14:38:50.473Z"
+stopped_at: Completed 06-01-PLAN.md
+last_updated: "2026-03-25T16:28:34.002Z"
 last_activity: 2026-03-23 — Completed 03-02 onboarding wizard, Slack OAuth, BYO API keys
 progress:
   total_phases: 6
   completed_phases: 5
-  total_plans: 22
-  completed_plans: 22
+  total_plans: 25
+  completed_plans: 23
   percent: 100
 ---
 
@@ -74,6 +74,7 @@ Progress: [██████████] 100%
 | Phase 05-employee-design PP02 | 5min | 2 tasks | 15 files |
 | Phase 05-employee-design P03 | 2min | 1 tasks | 0 files |
 | Phase 05-employee-design P04 | 1min | 2 tasks | 3 files |
+| Phase 06-web-chat P01 | 8min | 2 tasks | 11 files |
 
 ## Accumulated Context
 
@@ -159,6 +160,9 @@ Recent decisions affecting current work:
 - [Phase 05-employee-design]: All three creation paths (template, wizard, advanced) confirmed working by human review before Phase 5 marked complete
 - [Phase 05-employee-design]: /agents/new added to CUSTOMER_OPERATOR_RESTRICTED — startsWith check covers all sub-paths automatically
 - [Phase 05-employee-design]: catch re-throw in handleDeploy is minimal fix — existing createAgent.error UI was correctly wired, just never received the error
+- [Phase 06-web-chat]: WebSocket auth via first JSON message after connection — browser WebSocket API cannot send custom HTTP headers
+- [Phase 06-web-chat]: thread_id = conversation_id in web channel normalizer — scopes agent memory to one web conversation per conversation ID
+- [Phase 06-web-chat]: Redis pub-sub delivery: orchestrator publishes to webchat_response_key, WebSocket subscribes with 60s timeout before sending to client
 
 ### Roadmap Evolution
 
@@ -174,6 +178,6 @@ None — all phases complete.
 
 ## Session Continuity
 
-Last session: 2026-03-25T14:38:50.470Z
-Stopped at: Phase 6 context gathered
-Resume file: .planning/phases/06-web-chat/06-CONTEXT.md
+Last session: 2026-03-25T16:28:33.999Z
+Stopped at: Completed 06-01-PLAN.md
+Resume file: None