untrack local build-pc-cmd.bat (machine-specific paths); gitignore it

.gitignore

@@ -191,3 +191,4 @@ build-pyinst/
 # Local working junk (frame captures, timerun state, PPM dumps) - moved here
 # from repo root / scratch on 2026-09-18; never commit.
 /local/
+build-pc-cmd.bat

build-pc-cmd.bat

@@ -1,17 +0,0 @@
-@echo off
-REM D356-session fix: build the PC port from a plain cmd environment.
-REM
-REM Background: the pi agent shell (git-bash/MSYS) silently drops nearly all
-REM inherited env vars at the boundary into msys-2.0.dll programs (sh/gcc) --
-REM they see only ~7 MSYS-standard vars, so gcc has no TEMP/TMP and fails
-REM with "Cannot create temporary file in C:\Windows\: Permission denied"
-REM (silent exit 1 under ninja). cmd.exe carries the full Windows env, so we
-REM build through it with the MSYS2 toolchain prepended to PATH (needed for
-REM cc1's sibling DLLs) and a guaranteed-writable temp dir.
-setlocal
-set "PATH=C:\msys64\mingw64\bin;C:\msys64\usr\bin;%PATH%"
-set "TEMP=C:\Users\james\AppData\Local\Temp"
-set "TMP=%TEMP%"
-cd /d C:\Users\james\Source\Repos\gh-fullhist
-C:\msys64\mingw64\bin\cmake.exe --build build-pc -j %*
-endlocal & exit /b %errorlevel%