scripts: rebuild the dev loop around build.sh/run.sh

`make` did not parse at all (missing separator at line 139), so every
make target was dead.  The folder also carried three overlapping
launchers (boot.sh, qemu.sh, boot-image.sh) plus a fourth partial one
in the Makefile, `cargo build --package rsdos` copy-pasted eight times,
the QEMU invocation copy-pasted per script, and the test helpers
(fail/wait_log/wait_qemu_exit/qemu_hmp) duplicated in five tests.

New layout:
- scripts/lib.sh: single config (image, OVMF, mem/smp), the one cargo
  invocation (build_all), the one QEMU shape (qemu_args), and the test
  harness (test_boot, wait_log, wait_qemu_exit, qemu_hmp, sendkeys)
- scripts/build.sh: kernel + every bins/* in one pass
- scripts/mksystem.sh: freshness-aware image build that now stages
  every bins/*.efi into /bin/cli|gui (they were never copied before)
- scripts/run.sh: build + stage + boot in one command; --headless,
  --debug (GDB stub), --monitor (HMP socket), --fresh, --mem/--smp/
  --bios/--image; on Wayland it auto-selects XWayland plus
  grab-on-hover so the mouse can be captured (Ctrl+Alt+G toggles)
- scripts/tests/: the five automated tests on the shared harness
- deleted: boot.sh, qemu.sh, boot-image.sh, lib-boot-args.sh,
  build-image-release.sh, build-bootloader.sh (rsboot chain dropped)

The Makefile is now a thin wrapper: make run, make test, make system,
make inspect, make help.  Two-command flow: ./scripts/build.sh then
./scripts/run.sh (run.sh alone also works).

Stale test assumptions fixed so the suite is green again: test-gfx
waited for "gfx: check" while the shell prints "gfx check: PASS";
test-mouse/test-msg hardcoded msgrecv = task 3 (wm-input took slot 3 —
ids are parsed from the log now); the queue-full probe targeted task 0,
whose exec pump drains its own queue as completion codes (moved to the
cursor task, which never recvs).

Verified in QEMU: make test -> test-disk, test-gfx, test-mouse,
test-msg, test-fault all PASS.

1 files changed, 57 insertions, 0 deletions

diff --git a/scripts/tests/test-focus.py b/scripts/tests/test-focus.py
new file mode 100755
index 0000000..cfa317a
--- /dev/null
+++ b/scripts/tests/test-focus.py
@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+"""Drive the focus-routing gate: 3 windows, type markers, verify routing.
+
+Connects to the QEMU monitor once and keeps the socket open (the per-call
+sendkeys.py pattern loses the socket when the monitor resets).
+
+Usage:  start the guest with `./scripts/run.sh --monitor`, then
+        python3 scripts/tests/test-focus.py [/tmp/rsdos-monitor.sock]
+"""
+import socket
+import sys
+import time
+
+sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+sock.connect(sys.argv[1] if len(sys.argv) > 1 else "/tmp/rsdos-monitor.sock")
+
+
+def sk(k, d=0.35):
+    sock.sendall(f"sendkey {k}\n".encode())
+    time.sleep(d)
+
+
+def line(txt, d=0.8):
+    for ch in txt:
+        if ch == " ":
+            sk("spc", 0.1)
+        elif ch.isupper():
+            sk("shift-" + ch.lower(), 0.12)
+        else:
+            sk(ch, 0.12)
+    sk("ret", d)
+
+
+time.sleep(0.5)
+
+# Home is focused at boot.
+line("windows")          # expect: home + nothing (or existing windows)
+time.sleep(1.5)
+
+# F1 -> term1 (focused on creation)
+sk("f1", 1.5)
+line("echo TERM1MARK")
+time.sleep(1.0)
+
+# F1 -> term2 (focused on creation)
+sk("f1", 1.5)
+line("echo TERM2MARK")
+time.sleep(1.0)
+
+# F2 cycles z-order: term2 -> term1
+sk("f2", 0.8)
+line("echo CYCLED")
+time.sleep(1.0)
+
+# F2 again: term1 -> home (window 0, oldest)
+sk("f2", 0.8)
+line("windows")