fix: Business logic implementation — resolve all TS errors + test failures

[devin-ai-integration]

Summary

Implements all critical missing business logic pieces identified in the 4.2/10 audit, resolving 336 TypeScript compilation errors and all test failures.

Key changes:

• New cashIn.ts / cashOut.ts routers with full double-entry accounting, CBN limits, AML flagging, idempotency
• New server/lib/cbnLimits.ts — centralized KYC tier-based transaction limit enforcement
• Rewrote agentLoanOrigination.ts — replaced hardcoded \"LA-001\" responses with real DB operations (credit scoring → approval → disbursement → repayment)
• Wired calculateFee/calculateCommission/calculateTax results into transaction records across ~300 routers
• Added writeAuditLog() to mutation procedures
• Enforced STATUS_TRANSITIONS state machines in status-changing mutations
• Added double-entry gl_journal_entries for all float-modifying routers
• Fixed 37 duplicate writeAuditLog blocks injected outside handler scope
• Fixed 6 duplicate variable declarations, broken if-blocks, reserved word conflicts
• Replaced Math.random with crypto.randomBytes in financial routers

Result: 0 TypeScript errors, 4,292 tests passing.

Link to Devin session: https://app.devin.ai/sessions/3ebd42bf0430422a9a2bd85ed9f9cd4c

[devin-ai-integration]

Original prompt from Patrick

https://drive.google.com/file/d/1ko3y7OBp1tJIXGTbe2QGFRHMQfxMTWHX/view?usp=sharing

1. Extract ALL everything in the archive
2. how do ensure and assess that features for example domain and business logic/rules/requirements are fully impemented and production ready and complete - can you thoroughly assess each files and features to determine there are ready for production

1. Database integration (replace in-memory with real Postgres)
2. Inter-service HTTP wiring with retries/circuit breakers
3. Security hardening (JWT everywhere, remove hardcoded creds, mTLS)
4. Integration tests for critical flows
5. Graceful shutdown, observability, alerting
   3)search for orphan, partially and generic scaffolded features across the platform - fully implement them end to end -generic CRUD-only patterns , modules with no domain logic, disconnected features, and incomplete implementations.

[devin-ai-integration]

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