'''Do not make any visual modifications. The phrases I write are commands to understand what I want, not to be written down. Understand their content well, then execute what is required.''' Ekhon existing system er baire kono notun software, engine, agent, API ba major feature add korba na. Current 4 engine: KERN-01 E-COMM-01 FACT-01 PEER-01 Existing AI agents, APIs, tools, marketplace, factory, knowledge systems sob preserve koro. MAIN GOAL: Existing system ke aro strong koro. Real gap gula identify kore fill koro. Existing functionality break korba na. HARDENING: Authentication Authorization RBAC RLS Tenant isolation AAL2 admin protection HMAC verification API security Input validation DTO/output validation Rate limit Retry Timeout Idempotency Queue/worker reliability Error handling Audit logging Secret/config protection Data integrity Failure recovery Health checks Monitoring Backup/restore readiness ENGINE CHECK: KERN-01: Security, isolation, audit, core integrity test koro. E-COMM-01: Order → payment-state → entitlement → fulfillment lifecycle test koro. Payment Gateway ekhon activate korba na. FACT-01: Task → execution → worker → verification → result flow test koro. PEER-01: Peer authentication → HMAC → authorization → message integrity → failure handling test koro. AGENT CHECK: Design Agent Audit Agent Factory Agent Prottek agent er: permission tool access failure handling retry timeout output validation audit isolation prompt/tool security check koro. API CHECK: Existing 48 secured API abar verify koro. Check: auth authorization tenant isolation DTO error format rate limit idempotency logging timeout invalid input unauthorized access cross-tenant access INTERNAL TOOLS: Existing health check, API validation, tenant-isolation and diagnostic tools fully verify koro. Jodi obvious small gap thake and existing architecture diye safely fix kora jay, fix koro. But: No new product. No major engine. No new agent. No unnecessary API. No architecture expansion. No fake external integration. EXTERNAL: Domain and Payment Gateway untouched. Any other external dependency thakle only identify koro. Fake/mock diye production readiness claim korba na. TEST: Unit tests Integration tests Regression tests Security tests API tests Tenant isolation tests Failure/retry tests Worker tests End-to-end critical flow Build Typecheck Lint সব run koro. 95/95 existing regression pass preserve korte hobe. যদি নতুন regression হয়, fix kore abar full suite run koro. FINAL RESULT: Only report these: REAL GAPS FOUND GAPS FIXED SECURITY HARDENING DONE ENGINE HARDENING DONE AGENT HARDENING DONE API HARDENING DONE TEST RESULTS REMAINING REAL RISKS EXTERNAL BLOCKERS FINAL STATUS IMPORTANT: Existing functionality inventory change korba na unless code evidence diye bug পাওয়া যায়. No scope expansion. No major development. Only hardening + real gap filling + verification.