docs: Enhance development setup documentation and update environment variable validation

- Added a new section in CURRENT_STATUS.md detailing prerequisites and quick start instructions for development setup.
- Updated environment variable validation to include defaults for missing variables in env.ts.
- Improved error handling in errorHandler.ts for better validation feedback.
- Made various code adjustments across services to ensure robustness and clarity.

docs/CURRENT_STATUS.md

@@ -55,5 +55,31 @@ cd orchestrator; npm run dev
 
 ---
 
+---
+
+## 🔧 Development Setup
+
+### Prerequisites
+- Node.js 18+ installed
+- npm packages installed in both `webapp/` and `orchestrator/`
+- `.env` file created in `orchestrator/` (minimal config is fine for dev)
+
+### Quick Start
+```powershell
+# From project root
+.\scripts\start-all.ps1
+
+# Or manually:
+cd webapp; npm run dev
+cd orchestrator; npm run dev
+```
+
+### Status Check
+```powershell
+.\scripts\check-status.ps1
+```
+
+---
+
 **Last Checked**: 2025-01-15