[preset] Update Cross-Platform Governance preset to v0.2.1 (#3695)

* Update Cross-Platform Governance preset to v0.2.1

Update cross-platform-governance preset submitted by @hindermath to:
- presets/catalog.community.json (version, download_url, documentation, description, updated_at)
- docs/community/presets.md community presets table

Closes #3683

Assisted-by: GitHub Copilot (model: claude-sonnet-4.6, autonomous)
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* ci: pin ruff to 0.15.0 to avoid 0.16.0 default-ruleset breakage

ruff 0.16.0 expanded its default rule set from ~59 to ~413 rules,
causing the unpinned `uvx ruff check` step to report 1476 pre-existing
violations. Pin to 0.15.0 to restore green lint until the codebase is
audited against the new defaults.

Assisted-by: GitHub Copilot (model: Claude Opus 4.8, autonomous)

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Manfred Riem <15701806+mnriem@users.noreply.github.com>

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
           python-version: "3.14"
 
       - name: Run ruff check
-        run: uvx ruff check src tests
+        run: uvx ruff@0.15.0 check src tests
 
   pytest:
     runs-on: ${{ matrix.os }}