feat: add process module with arguments and allArguments static methods

- Introduce new 'process' module exposing a Process class with foreign static methods for accessing command-line arguments.
- Implement processSetArguments in main.c to store argc/argv, and processAllArguments in process.c to return them as a Wren list.
- Add --help flag support to CLI, printing usage with optional arguments.
- Include documentation for Process.arguments and Process.allArguments, plus module index and template updates.
- Register process module in modules.c and add Xcode project references for new source files.
- Add test scripts for allArguments and arguments, verifying list type, count, and expected values.

doc/site/modules/template.html

@@ -37,6 +37,7 @@
       <h2>cli</h2>
       <ul>
         <li><a href="io">io</a></li>
+        <li><a href="process">process</a></li>
         <li><a href="scheduler">scheduler</a></li>
         <li><a href="timer">timer</a></li>
       </ul>
@@ -64,6 +65,7 @@
         <td>
           <ul>
             <li><a href="io">io</a></li>
+            <li><a href="process">process</a></li>
             <li><a href="scheduler">scheduler</a></li>
             <li><a href="timer">timer</a></li>
           </ul>