feat(debug): complete the interactive debugger with disassembly, breakpoints, watchpoints and execution control

Assisted-by: DeepSeek V4 Pro

debug/ptrace_linux_amd64.go

@@ -222,6 +222,34 @@ func (s *Session) ReadMemory(addr uint64, length int) ([]byte, error) {
 	return out, nil
 }
 
+// WriteMemory writes bytes to the debuggee's memory at addr.
+func (s *Session) WriteMemory(addr uint64, data []byte) error {
+	for i := 0; i < len(data); i += 8 {
+		end := i + 8
+		if end > len(data) {
+			end = len(data)
+		}
+		var word uint64
+		for j := 0; j < end-i; j++ {
+			word |= uint64(data[i+j]) << (8 * j)
+		}
+		// For partial writes, read-modify-write the existing word.
+		if end-i < 8 {
+			existing, err := s.Peek(addr + uint64(i))
+			if err != nil {
+				return err
+			}
+			// Clear the bytes we're overwriting and merge.
+			mask := ^((uint64(1) << (8 * (end - i))) - 1)
+			word = (existing & mask) | word
+		}
+		if err := s.Poke(addr+uint64(i), word); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // Step executes a single instruction in the debuggee.
 func (s *Session) Step() error {
 	if s.exited {