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, 98 insertions, 0 deletions

diff --git a/scripts/tests/test-msg.sh b/scripts/tests/test-msg.sh
new file mode 100755
index 0000000..7786beb
--- /dev/null
+++ b/scripts/tests/test-msg.sh
@@ -0,0 +1,98 @@
+#!/usr/bin/env bash
+#
+# scripts/tests/test-msg.sh — automated scheduler message-queue round trip.
+#
+# Tests all message types (user, timer, key, mouse), real-input routing,
+# and the queue-full boundary.
+#
+# Usage: ./scripts/tests/test-msg.sh
+# Env:   SYSTEM_IMG, OVMF, QEMU (see scripts/lib.sh)
+#
+set -euo pipefail
+TNAME="msg"
+# shellcheck source=../lib.sh
+source "$(dirname "$0")/../lib.sh"
+
+echo "==> 1/5 build (kernel + bins)"
+build_all
+
+echo "==> 2/5 stage system image"
+stage_image --force
+
+echo "==> 3/5 boot QEMU (headless)"
+test_boot
+
+echo "==> 4/5 drive the shell (msgrecv / send / mouse routing / queue-full)"
+# msgrecv's task id is assigned at spawn time and shifts when the task
+# table grows (the Windowed GUI added wm-input at slot 3) — read it from
+# the log instead of hardcoding.
+sendkeys "msgrecv"
+sleep 1
+MID="$(sed -n 's/.*msgrecv: task \([0-9][0-9]*\) listening.*/\1/p' "$LOG" | tail -1)"
+[ -n "$MID" ] || fail "msgrecv did not spawn (no 'msgrecv: task N listening' in the log)"
+echo "  msgrecv task id: $MID"
+
+sendkeys \
+        "send $MID user 42" \
+        "send $MID timer" \
+        "send $MID key enter" \
+        "send $MID key ctrl-c" \
+        "send $MID key f3" \
+        "send $MID mouse 5 -3 3" \
+        "sleep 800" \
+        "jobs"
+
+sendkeys "mouse $MID"
+qemu_hmp "mouse_move 20 7"
+qemu_hmp "mouse_button 1"
+qemu_hmp "mouse_move -5 -3"
+qemu_hmp "mouse_button 0"
+qemu_hmp "sendkey ctrl-c"
+
+# Queue-full probe: overflow a queue that nobody drains.  The shell used
+# to be that task, but its exec pump now consumes its own User messages
+# as completion codes (q=0 at the prompt), and msgrecv consumes on wake —
+# the cursor task never calls recv, so its 16-slot ring fills for real.
+CID="$(awk '$2 == "cursor" { print $1 }' "$LOG" | tail -1)"
+[ -n "$CID" ] || fail "no cursor task in jobs output (cannot probe queue-full)"
+echo "  queue-full target: task $CID (cursor, never recv'd)"
+
+sendkeys \
+        "send $CID user 1" \
+        "send $CID user 2" \
+        "send $CID user 3" \
+        "send $CID user 4" \
+        "send $CID user 5" \
+        "send $CID user 6" \
+        "send $CID user 7" \
+        "send $CID user 8" \
+        "send $CID user 9" \
+        "send $CID user 10" \
+        "send $CID user 11" \
+        "send $CID user 12" \
+        "send $CID user 13" \
+        "send $CID user 14" \
+        "send $CID user 15" \
+        "send $CID user 16" \
+        "send $CID user 17" \
+        "sleep 800" \
+        "jobs" \
+        "poweroff"
+
+echo "==> 5/5 wait for shutdown + verify"
+wait_qemu_exit 30 || fail "QEMU did not exit after poweroff"
+
+grep -aq "msgrecv: task $MID listening" "$LOG" || fail "msgrecv did not spawn"
+grep -aq "msgrecv\[$MID\]: User(42)" "$LOG" || fail "user message missing"
+grep -aq "msgrecv\[$MID\]: Timer" "$LOG" || fail "timer message missing"
+grep -aq "msgrecv\[$MID\]: Key(Enter)" "$LOG" || fail "key enter missing"
+grep -aq "msgrecv\[$MID\]: Key(Ctrl-c)" "$LOG" || fail "key ctrl-c missing"
+grep -aq "msgrecv\[$MID\]: Key(F3)" "$LOG" || fail "key f3 missing"
+grep -aq "msgrecv\[$MID\]: Mouse(+5,-3 L R)" "$LOG" || fail "synthesized mouse message missing"
+grep -aq "msgrecv\[$MID\]: Mouse(+20,+7" "$LOG" || fail "real mouse move 20,7 not routed to queue"
+grep -aq "msgrecv\[$MID\]: Mouse(-5,-3 L" "$LOG" || fail "held-button routed move missing"
+grep -aq "queue full" "$LOG" || fail "17th send did not report queue full"
+grep -aq "send: unknown type" "$LOG" && fail "a bad send slipped through (expected none)"
+
+echo ""
+echo "PASS — message queues OK"