diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
index f0d08c2..bc3920c 100644
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@@ -103,7 +103,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 
 **Wave 1**
 
-- [ ] 03-01-PLAN.md -- Module SDK, Prisma Registry, Activation API
+- [x] 03-01-PLAN.md -- Module SDK, Prisma Registry, Activation API
 
 **Wave 2** *(blocked on Wave 1 completion)*
 
@@ -113,6 +113,7 @@ Decimal phases appear between their surrounding integers in numeric order.
 **Wave 3** *(blocked on Wave 2 completion)*
 
 - [ ] 03-04-PLAN.md -- Visual Verification: Human confirms module system
+
 **UI hint**: yes
 
 ### Phase 4: Marketplace & Portal Navigation
@@ -172,7 +173,7 @@ Phases execute in numeric order: 1 -> 2 -> 3 -> 4 -> 5 -> 6
 |-------|----------------|--------|-----------|
 | 1. Foundation & Portal Shell | 2/3 | In Progress | - |
 | 2. Authentication & Multi-Tenancy | 2/5 | In Progress|  |
-| 3. Module System & Domaincheck | 0/4 | Not started | - |
+| 3. Module System & Domaincheck | 1/4 | In Progress|  |
 | 4. Marketplace & Portal Navigation | 0/TBD | Not started | - |
 | 5. Dashboard & Calendar | 0/TBD | Not started | - |
 | 6. Desktop Client & CI/CD | 0/TBD | Not started | - |
diff --git a/.planning/STATE.md b/.planning/STATE.md
index 313c1fd..52e0010 100644
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@@ -4,13 +4,13 @@ milestone: v1.0
 milestone_name: milestone
 status: executing
 stopped_at: Completed 02-02-PLAN.md
-last_updated: "2026-06-18T11:41:48.379Z"
-last_activity: 2026-06-18 -- Plan 01-02 Portal Shell complete
+last_updated: "2026-06-19T10:27:41.286Z"
+last_activity: 2026-06-19 -- Phase 03 execution started
 progress:
   total_phases: 6
   completed_phases: 1
-  total_plans: 8
-  completed_plans: 5
+  total_plans: 12
+  completed_plans: 7
   percent: 17
 ---
 
@@ -21,16 +21,16 @@ progress:
 See: .planning/PROJECT.md (updated 2026-06-18)
 
 **Core value:** Eine zentrale Plattform, in der beliebige Workflow-Tools als Module lizenziert, aktiviert und genutzt werden koennen -- ohne zwischen verschiedenen Anwendungen wechseln zu muessen.
-**Current focus:** Phase 1 - Foundation & Portal Shell
+**Current focus:** Phase 03 — module-system-domaincheck
 
 ## Current Position
 
-Phase: 1 of 6 (Foundation & Portal Shell)
-Plan: 3 of 3 in current phase (completed)
-Status: Ready to execute
-Last activity: 2026-06-18 -- Plan 01-02 Portal Shell complete
+Phase: 03 (module-system-domaincheck) — EXECUTING
+Plan: 1 of 4
+Status: Executing Phase 03
+Last activity: 2026-06-19 -- Phase 03 execution started
 
-Progress: [██░░░░░░░░] 10%
+Progress: [██▓░░░░░░░] 25%
 
 ## Performance Metrics
 
@@ -53,6 +53,7 @@ Progress: [██░░░░░░░░] 10%
 
 *Updated after each plan completion*
 | Phase 02-authentication-multi-tenancy P02 | 8min | 3 tasks | 26 files |
+| Phase 02-authentication-multi-tenancy P03 | 5min | 2 tasks | 20 files |
 
 ## Accumulated Context