progress on serial and added editor

doc/interrupts.md

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+0   => **InvalidInterrupt** – CPU exception for an invalid interrupt request  
+1   => **PageFault** – CPU exception triggered by an illegal memory access  
+2   => **ProtectionFault** – CPU exception for a protection violation (e.g., privilege level)  
+3   => **InvalidOpcode** – CPU exception for executing an undefined opcode  
+4   => **DivideByZero** – CPU exception when dividing by zero  
+5   => **StackOverflow** – CPU exception due to stack overflow  
+6   => **WriteToReadOnly** – CPU exception for writing to a read‑only segment  
+7   => **ReadFromWriteOnly** – CPU exception for reading from a write‑only segment  
+8   => **UnmappedIo** – CPU exception for accessing unmapped I/O  
+
+> **Reserved Range (9–31):** Future CPU exceptions
+
+---
+
+### IRQ Range (32–63)
+
+- **Hardware** – Represents hardware interrupt requests. 
+
+32 => **SerialIn** – Interrupt triggered by serial input
+
+---
+
+### Syscall Range (64–255)
+
+- **Software(u8)** – Represents system calls.  
+  The enum is aliased to start at value **128**, so valid syscall numbers are 128‑255.  
+  Programs typically use the range **64–127** for OS‑defined syscalls, while values ≥128 are reserved for software interrupts.