docs(18.1): record phase planned in state

.planning/STATE.md

@@ -1,18 +1,18 @@
 ---
 msd_state_version: "1.0"
 milestone: v1.0
-current_phase: 18
-current_phase_name: Payment Gateway
+current_phase: "18.1"
+current_phase_name: payment-gateway-subscriptions
 status: executing
 stopped_at: Completed 18-08-PLAN.md
-last_updated: "2026-10-13T22:20:51.124Z"
+last_updated: "2026-10-14T12:32:40.622Z"
 last_activity: 2026-10-13
 last_activity_desc: Phase 18 execution started
-state_head: d1f39cc109c410fc9a0325b352b1df4361e63f55
+state_head: e37ccbeacbd85ad4b41ebd54e61f1ec279a74d59
 progress:
   total_phases: 40
   completed_phases: 14
-  total_plans: 176
+  total_plans: 182
   completed_plans: 176
 gsd_state_version: "1.0"
 milestone_name: milestone
@@ -29,7 +29,7 @@ See: .planning/PROJECT.md (updated 2026-10-12)
 
 ## Current Position
 
-Phase: 18 (Payment Gateway) — EXECUTING
+Phase: 18.1 (payment-gateway-subscriptions) — READY TO EXECUTE
 Plan: 8 of 8
 Status: Ready to execute
 Last activity: 2026-10-13 — Phase 18 execution started