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.

orchestrator/src/services/planValidation.ts

@@ -115,9 +115,9 @@ export function checkStepDependencies(steps: PlanStep[]): ValidationResult {
 function getStepOutput(step: PlanStep): { asset: string; amount: number } | null {
   switch (step.type) {
     case "borrow":
-      return { asset: step.asset, amount: step.amount };
+      return step.asset ? { asset: step.asset, amount: step.amount } : null;
     case "swap":
-      return { asset: step.to, amount: step.amount };
+      return step.to ? { asset: step.to, amount: step.amount } : null;
     default:
       return null;
   }