Add MATLAB buildtool support for CI tasks

[Copilot]

Adds support for MATLAB's buildtool framework (CodeIssuesTask, TestTask) as an alternative to the existing codecheckToolbox/testToolbox wrapper functions.

buildfile.m (root)

• Defines setup, check, and test tasks using MATLAB's built-in task classes
• check and test depend on setup for path initialization
• Requires R2023b+

buildtool check   % Run code analysis via CodeIssuesTask
buildtool test    % Run tests via TestTask
buildtool         % Both (default tasks)

code/templates/buildfile.m

• Template for downstream projects using MatBox, with conditional installMatBox() guard

GitHub Actions (check-code, test-code)

• Actions now detect buildfile.m at repo root
• Present → matlab-actions/run-build@v2
• Absent → existing run-command fallback (no breaking change)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Suggestion: Use MATLAB's buildtool</issue_title>
<issue_description>Look into using MATLAB's buildtool for the CI tasks</issue_description>

Comments on the Issue (you are @copilot in this section)

@ehennestad MATLAB currently supports the following tasks for the buildtool: | Task Class | Description | |-------------------------------------------|-------------------------------| | `matlab.buildtool.tasks.CodeIssuesTask` | Task for identifying code issues | | `matlab.buildtool.tasks.TestTask` | Task for running tests |

These are more or less equivalent to testToolbox and codecheckToolbox

Pros of matlab.buildtool.tasks

• MATLAB builtin
• CodeIssuesTask supports custom code analyzer configuration
• CodeIssuesTask can save reports

Cons of matlab.buildtool.tasks

• Need custom tasks for custom setup, i.e install requirements, running startup.m etc
• Need separate tasks for creating .svg badges
• Less cutomizable in general</comment_new>
  <comment_new>@ehennestad
  Added branch for trying it out: https://github.com/ehennestad/MatBox/tree/feature/buildtool-support</comment_new>

• Fixes Suggestion: Use MATLAB's buildtool #28

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