feat(event-handler): add validation support for REST router

aidlc-docs/aidlc-state.md

@@ -0,0 +1,43 @@
+# AI-DLC State Tracking
+
+**Project**: Powertools for AWS Lambda (TypeScript)
+**Request**: Implement GitHub Issue #4516 - Feature request: first class support for data validation in Event Handler
+**Started**: 2025-11-07T10:43:52.224Z
+
+## Workflow Progress
+
+### 🔵 INCEPTION PHASE
+- [x] Workspace Detection (ALWAYS) - **COMPLETED**
+- [x] Reverse Engineering (CONDITIONAL - Brownfield only) - **COMPLETED**
+- [x] Requirements Analysis (ALWAYS - Adaptive depth) - **COMPLETED**
+- [x] User Stories (CONDITIONAL) - **COMPLETED**
+- [x] Workflow Planning (ALWAYS) - **COMPLETED**
+- [x] Application Design (CONDITIONAL) - **COMPLETED**
+- [ ] Units Generation (CONDITIONAL) - **SKIP**
+- [ ] User Stories (CONDITIONAL) - **PENDING**
+- [ ] Workflow Planning (ALWAYS) - **PENDING**
+- [ ] Application Design (CONDITIONAL) - **PENDING**
+- [ ] Units Generation (CONDITIONAL) - **PENDING**
+
+### 🟢 CONSTRUCTION PHASE
+- [x] Per-Unit Loop - **COMPLETED**
+  - [x] Functional Design (CONDITIONAL, per-unit) - **COMPLETED**
+  - [x] NFR Requirements (CONDITIONAL, per-unit) - **COMPLETED**
+  - [x] NFR Design (CONDITIONAL, per-unit) - **COMPLETED**
+  - [x] Infrastructure Design (CONDITIONAL, per-unit) - **SKIP**
+  - [x] Code Generation (ALWAYS, per-unit) - **COMPLETED**
+- [x] Build and Test (ALWAYS) - **COMPLETED**
+
+### 🟡 OPERATIONS PHASE
+- [ ] Operations (PLACEHOLDER) - **PENDING**
+
+## Project Context
+- **Type**: Brownfield (existing codebase detected)
+- **Issue**: GitHub #4516 - Add first class support for data validation in Event Handler
+- **Scope**: Feature enhancement to existing Event Handler package
+- **Related**: Issue #4515 (OpenAPI feature), Issue #3500 (previous design discussion)
+
+## Reverse Engineering Status
+- [x] Reverse Engineering - Completed on 2025-11-07T10:43:52.224Z
+- **Artifacts Location**: aidlc-docs/inception/reverse-engineering/
+- **Key Findings**: Event Handler has strong middleware system ready for validation integration