feat: write badge JSON instead of rendering SVG via pybadges

[ehennestad]

Summary

Removes the runtime dependency on Python, pip, and the deprecated pybadges package by moving badge SVG rendering out of MATLAB. Supersedes #47.

• When the MATBOX_BADGE_FORMAT=json environment variable is set (current matbox-actions set it — feat: render SVG badges from MatBox badge JSON with badge-maker matbox-actions#8), testToolbox and codecheckToolbox write badge descriptions as JSON (docs/reports/badges/*.json) and CI renders them to .github/badges/*.svg with badge-maker, the shields.io reference implementation (CC0, local render, no external service)
• Without the variable — local runs, or repositories pinned to older matbox-actions refs (which still install the latest MatBox) — badge creation falls back to the legacy pybadges SVG path, so no combination of action/MatBox versions loses badges and merge order does not matter
• createBadgeSvg is deprecated but remains as the fallback; the matbox.py namespace is retained — it is independently useful for downstream toolboxes with Python requirements
• MatBox's own CI migrates to the matbox-actions@v1 reusable test workflow; the duplicate internal actions and reusable workflows are deleted from main (repositories pinned to @v0.9 resolve via the tag and keep working through the pybadges fallback)
• tools/tasks/codecheckToolbox wrapper now accepts varargin, required because the v1 check-code action forwards name-value arguments to wrappers

Tests

New TasksTest case sets MATBOX_BADGE_FORMAT=json and verifies codecheckToolbox writes code_issues.json with the expected label and a valid color. Full TasksTest suite passes locally (5/5).

The legacy pybadges path can be deleted in a future major release once older matbox-actions refs are retired. Expect a one-time badge-churn commit in downstream repos on first run with both changes (badge-maker's markup differs slightly from pybadges'; visually equivalent).

🤖 Generated with Claude Code

[github-actions]

Test Results

24 tests   24 ✅  24s ⏱️
 5 suites   0 💤
 1 files     0 ❌

Results for commit acb6e4e.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.75%. Comparing base (2519f3d) to head (2548ff3).
⚠️ Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
code/+matbox/+tasks/testToolbox.m	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   42.02%   44.75%   +2.72%     
==========================================
  Files          59       61       +2     
  Lines        1468     1524      +56     
==========================================
+ Hits          617      682      +65     
+ Misses        851      842       -9     

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