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/tools/pe-tools/build.ps1

@@ -0,0 +1,60 @@
+# build.ps1 — 编译 Deshab PE 系统工具（mingw-w64 g++）
+#
+# GUI 工具 → SYSTEM/program/*.exe（开始菜单 STARTMENU.CNF 启动，窗口嵌入桌面）
+# CLI 工具 → SYSTEM/bin/*.exe（CMD 里敲名字运行，输出走串口）
+#
+# 编译模式与 CODE/tools/pe-samples/hello64.c 相同：
+#   -nostartfiles -Wl,--entry,main -Wl,--image-base,0x140000000
+# （无 CRT 启动；只准调 pe_shim 表内的 Win32 面）
+#
+# 用法: powershell -File build.ps1 [-Gxx <g++路径>]
+
+param([string]$GxxPath = "")
+
+$ErrorActionPreference = "Stop"
+$Root = (Resolve-Path "$PSScriptRoot\..\..\..").Path
+$ProgDir = Join-Path $Root "SYSTEM\program"
+$BinDir = Join-Path $Root "SYSTEM\bin"
+
+# 定位 g++：参数 > PATH > msys2 默认位置
+$gxx = $null
+if ($GxxPath -and (Test-Path $GxxPath)) {
+    $gxx = $GxxPath
+} elseif (Get-Command g++ -ErrorAction SilentlyContinue) {
+    $gxx = (Get-Command g++).Source
+} elseif (Test-Path "C:\msys64\mingw64\bin\g++.exe") {
+    $gxx = "C:\msys64\mingw64\bin\g++.exe"
+} else {
+    throw "g++ not found (install msys2 mingw-w64 or pass -GxxPath)"
+}
+Write-Host "[pe-tools] g++ = $gxx"
+
+$Flags = @(
+    "-O2", "-Wall", "-std=c++17",
+    "-nostartfiles",
+    "-Wl,--entry,main",
+    "-Wl,--image-base,0x140000000"
+)
+
+# GUI 工具（user32 消息循环 + gdi32 DIB/BitBlt）
+$GuiTools = @("sysinfo", "clock", "paint", "notes")
+# CLI 工具（putchar/puts/ExitProcess）
+$CliTools = @("pciscan", "portio")
+
+foreach ($t in $GuiTools) {
+    $src = Join-Path $PSScriptRoot "$t.cpp"
+    $out = Join-Path $ProgDir "$t.exe"
+    & $gxx @Flags $src -o $out -lgdi32 -luser32
+    if ($LASTEXITCODE -ne 0) { throw "build failed: $t" }
+    Write-Host "[pe-tools] GUI  $t -> SYSTEM\program\$t.exe"
+}
+
+foreach ($t in $CliTools) {
+    $src = Join-Path $PSScriptRoot "$t.cpp"
+    $out = Join-Path $BinDir "$t.exe"
+    & $gxx @Flags $src -o $out
+    if ($LASTEXITCODE -ne 0) { throw "build failed: $t" }
+    Write-Host "[pe-tools] CLI  $t -> SYSTEM\bin\$t.exe"
+}
+
+Write-Host "[pe-tools] done. (imports must stay within pe_shim table; verify with objdump -p)"