feat(userspace): terminal server + shell desktop; US keymap w/ shift; libkos allocator multi-page fix; panics print

crates/init/src/manifest.rs

@@ -60,6 +60,8 @@ pub const SERVERS: &[Program] = &[
         // The framebuffer alone is ~1000 pages at 1280x800.
         ..server("display", b"display.elf", Limits { pages: 1280, regions: 4, ..SMALL })
     },
+    // Text on the display, lines from the keyboard (it takes input focus).
+    Program { uses: &["display"], ..server("terminal", b"terminal.elf", SMALL) },
     server("permis", b"permis.elf", SMALL),
     server("session", b"session.elf", SMALL),
 ];
@@ -76,6 +78,6 @@ pub const TESTS: &[Program] = &[Program {
 /// The desktop; the test image runs the SMP self-test instead.
 pub const APPS: &[Program] = &[Program {
     serves: false,
-    uses: &["display"],
-    ..server("snake", b"snake.elf", Limits { pages: 128, ..SMALL })
+    uses: &["terminal"],
+    ..server("shell", b"shell.elf", SMALL)
 }];