refactor: build.bat flexible argument parsing, add run & help commands

- Replaced positional `%1` checks with a loop-based argument parser
  so flags (`test`, `clean`, `run`, `help`) work in any order/combination
- Added `run` flag: executes `bin\WASURO.exe` after a successful build
- Added `help` flag: prints usage info and exits
- Fixed `clean` early-exit to also check `DO_RUN` (not just `TESTFLAGS`),
  so `build.bat clean run` correctly continues to build+run
- Added section comment headers (Build, Run) for consistency

build.bat

@@ -8,7 +8,34 @@ set LIB=%ROOT%lib
 set FPC=C:\Lazarus\fpc\3.2.2\bin\x86_64-win64\fpc.exe
 
 set TESTFLAGS=
+set DO_CLEAN=0
+set DO_RUN=0
+
+:parse_args
+if "%1"=="" goto args_done
 if "%1"=="test" set TESTFLAGS=-dRUN_TESTS
+if "%1"=="clean" set DO_CLEAN=1
+if "%1"=="run" set DO_RUN=1
+if "%1"=="help" (
+    echo Usage: build.bat [options]
+    echo Options:
+    echo   test   - Build with tests enabled
+    echo   clean  - Clean build outputs
+    echo   run    - Run the built executable after building
+    echo   help   - Show this help message
+    exit /b 0
+)
+shift
+goto parse_args
+:args_done
+
+if %DO_CLEAN%==1 (
+    echo Cleaning build outputs...
+    if exist "%BIN%" rd /s /q "%BIN%"
+    if exist "%LIB%" rd /s /q "%LIB%"
+    echo Clean complete.
+    if "%TESTFLAGS%"=="" if %DO_RUN%==0 exit /b 0
+)
 
 if not exist "%BIN%" mkdir "%BIN%"
 if not exist "%LIB%" mkdir "%LIB%"
@@ -17,6 +44,7 @@ REM ── Lint ─────────────────────
 powershell -NoProfile -ExecutionPolicy Bypass -File "%ROOT%lint.ps1" -SrcRoot "%SRC%"
 if %ERRORLEVEL% NEQ 0 exit /b 1
 
+REM ── Build ────────────────────────────────────────────────────────────
 "%FPC%" ^
   %TESTFLAGS% ^
   -FE"%BIN%" ^
@@ -42,3 +70,9 @@ if %ERRORLEVEL% NEQ 0 (
 )
 
 echo Build succeeded: %BIN%\WASURO.exe
+
+REM ── Run ────────────────────────────────────────────────────────────
+if %DO_RUN%==1 (
+    echo Running WASURO...
+    "%BIN%\WASURO.exe"
+)