feat: add is_terminal_attached syscall

programs/man/syscalls.2

@@ -422,6 +422,10 @@
     Read from the kernel ring log buffer.
         int64_t montauk::read_log(char* buf, uint64_t size);
 
+.B SYS_LOG_WRITE (176)
+    Append a userspace message to the system log.
+        int64_t montauk::write_log(const char* message);
+
 .SH I/O REDIRECTION
     Used by the terminal app and similar programs to run a child
     process with its console I/O captured instead of going directly
@@ -447,6 +451,11 @@
     Tell a redirected child its terminal dimensions changed.
         int montauk::childio_settermsz(int childPid, int cols, int rows);
 
+.B SYS_TERMINAL_ATTACHED (177)
+    Return 1 when the calling process has a redirected userspace
+    terminal output stream, otherwise return 0.
+        bool montauk::terminal_attached();
+
 .SH WINDOW SERVER
     Window server syscalls are used by GUI programs to create and
     drive an on-screen window (see montauk/Window.hpp for the