feat(panic): FUCK [panic] mode=strict|fallback + realtest image variant

- UTSM panic_full returns in fallback mode (logs [PANIC:FALLBACK] + code + hit
  count); panic_halt keeps always-halt sites (CPU exception, VMM-E11 LA57,
  VMM-E15 DSK jump, UTSM-E42 test hook). Call sites given safe continuations.
- Mode passed to DSK/FirstInit/login/desktop via DSK_BOOT_FLAG_PANIC_FALLBACK;
  DKM kernel_api.panic / kern.log.panic return to driver; ext4 fatal aborts the
  op via setjmp/longjmp and DSK falls back to FAT32 ESP.
- build.ps1/Makefile: dev=strict, release=fallback, new realtest (release
  options + strict); default -Variant all; serialized iso packing under -j.
- Fix '*/' inside comments (dkm.h, kernel_api.h, bus.c) that broke the build.
- Includes pending work: dkm_bus service bus, mt7920/wlan drivers, desktop
  files/startmenu/prank, pe-tools, diskinfo, docs.

Co-authored-by: Cursor <cursoragent@cursor.com>

CODE/desktop/MAKEFILE

@@ -9,7 +9,7 @@ LDFLAGS := -nostdlib -static -pie -z max-page-size=0x1000 -T linker.ld
 
 C_SOURCES := main.c input.c wm.c compositor.c apps_builtin.c appreg.c \
              launcher.c lxc.c shell.c pages.c f32io.c ascii_font.c zhfont.c \
-             wallpaper.c taskbar.c textures.c
+             wallpaper.c taskbar.c textures.c prank.c files.c startmenu.c
 OBJECTS := $(C_SOURCES:.c=.o)
 
 .PHONY: all clean