vt → per-instance Terminal rendering into a pixel buffer

- Refactor vt.rs into a per-instance Terminal struct (owned cell/rendered
  grids, cursor, ANSI parser, scroll state), rendering glyphs into a
  caller-owned pixel buffer with dirty-region blitting
- Add gop buffer primitives (buffer_glyph_px, buffer_shift_up) and keep
  the legacy vt:: API as thin wrappers around the home terminal
- Remove the now-obsolete scroll hook and shadow scroll path
- Home terminal renders into its own buffer; window_id stays None until
  the WM integration lands

1 files changed, 0 insertions, 8 deletions

diff --git a/rsdos/src/main.rs b/rsdos/src/main.rs
index 89df5ea..b147e63 100644
--- a/rsdos/src/main.rs
+++ b/rsdos/src/main.rs
@@ -410,14 +410,6 @@ pub unsafe extern "efiapi" fn efi_main(image_handle: Handle, system_table: *mut
     // park in poll_key with a fixed frame, so the watchdog's boot-phase spin
     // rule for task 0 is disarmed (boot-phase hangs already panicked).
     rsnix::sched::mark_shell_running();
-    // Shell-entry self-check: verify the vt grid structs are sane right
-    // before the shell's first print.  The OptiPlex crashes in the first
-    // banner write when the cells VecData (or the shadow) holds the
-    // firmware's 0xAA fill instead of real values — this line shows
-    // whether the corruption is already present at shell entry or lands
-    // later, and prints the exact field values when it is.
-    rsnix::vt::debug_verify();
-
     // Windowed GUI: initialise the window manager and its input pump.
     // The console (vt) stays layer 0; GUI apps are windows composited on top.
     rsnix::wm::init();