Seeking Review and Validation: Minimalist Arduino Mega Circuit Design

[westfw]

@Sooraj011

could you give specification about how do i use clamping diodes in reset pin.

This is from Uno Rev3:

It prevents the auto-reset pulse capacitor from acting like a voltage doubler and sending the chip into HV programming mode.
See Regression between uno and uno R2 VALIDATED. HARDWARE PROBLEM CONFIRMED