fix: MATLAB Engine access denied + missing tomli/taskgroup for py3.10

1. MATLAB Engine build failed with "Zugriff verweigert" (access denied)
   because pip tried to create build/ inside C:\Program Files\MATLAB
   which is read-only. Now copies the source to %TEMP% before building.

2. Added tomli (needed by cyclopts on Python <3.11, since tomllib is
   only in stdlib from 3.11+) and taskgroup (needed by anyio on <3.11).
   These conditional deps weren't captured when downloading from py3.11.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: HanSur94

install.bat

@@ -244,8 +244,20 @@ python -c "import matlab.engine" >nul 2>&1
 if %errorlevel% equ 0 (
     echo  MATLAB Engine API already installed. Skipping.
 ) else (
-    echo  Installing from !ENGINE_API_DIR! (offline, no download needed^)...
-    pip install "!ENGINE_API_DIR!" --no-build-isolation --quiet 2>&1
+    :: Copy MATLAB Engine source to a temp dir because pip tries to create
+    :: a build/ folder in the source directory, which fails with "Access denied"
+    :: when the source is in C:\Program Files (read-only without admin).
+    set "ENGINE_TEMP=%TEMP%\matlab_engine_build"
+    if exist "!ENGINE_TEMP!" rd /s /q "!ENGINE_TEMP!" >nul 2>&1
+    echo  Copying MATLAB Engine source to writable temp directory...
+    xcopy "!ENGINE_API_DIR!" "!ENGINE_TEMP!" /E /I /Q /Y >nul 2>&1
+    if %errorlevel% neq 0 (
+        echo  [WARNING] Could not copy MATLAB Engine source files.
+        echo            Continuing with MCP server installation...
+        goto :install_mcp
+    )
+    echo  Installing from temp copy (offline, no download needed^)...
+    pip install "!ENGINE_TEMP!" --no-build-isolation --quiet 2>&1
     if %errorlevel% neq 0 (
         echo.
         echo  [WARNING] MATLAB Engine API installation failed.
@@ -260,6 +272,8 @@ if %errorlevel% equ 0 (
     ) else (
         echo  [OK] MATLAB Engine API installed.
     )
+    :: Clean up temp copy
+    rd /s /q "!ENGINE_TEMP!" >nul 2>&1
 )
 echo.
 

requirements-lock.txt

@@ -75,6 +75,8 @@ shellingham==1.5.4
 sortedcontainers==2.4.0
 sse-starlette==3.3.3
 starlette==0.52.1
+taskgroup==0.2.2
+tomli==2.4.0
 typer==0.24.1
 typing-inspection==0.4.2
 typing_extensions==4.15.0