01Nginx Readiness: Validates syntax, SSL certificates, and path-based proxy routing.
02Port Connectivity: Confirms backend processes are listening on the correct production ports.
03Env Contract Validation: Verifies presence and correctness of mandatory environment variables.
04Real-time Verification: Tests Socket.IO and WebSocket handshake connectivity and protocol upgrades.
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06Residual Scan: Detects localhost, internal IPs, or old domain leaks in build artifacts.