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/UTSM/drr/drr_stub.c

@@ -378,6 +378,7 @@ void drr_driver_recovery_dispatch(const dkm_driver_recovery_ops *ops, void *drv)
     if (!ops) {
         panic_full("DRR-E06 DRIVER RECOVERY OPS MISSING",
                    "driver did not provide dkm_driver_recovery_ops", 0);
+        return;
     }
     panic_full("DRR-E07 DRIVER RECOVERY NOT IMPLEMENTED",
                "quiesce/reset/reinit dispatch: designed (DKM README), not implemented", 0);