feat: live tracker suite - WIKITOOL_TASKS_CONFIG override, real-tracker tests for Super Productivity and CalDAV, nightly workflow and test image (#156)

Files changed:
- .gitea/scripts/start-radicale.sh
- .gitea/sp-live/Dockerfile
- .gitea/sp-live/resolve-version.sh
- .gitea/workflows/ci.yml
- .gitea/workflows/sp-live-image.yml
- .gitea/workflows/tracker-live.yml
- .gitignore
- CHANGES.md
- DEVELOPMENT.md
- INSTALL.md
- VERSION
- instructions/dev/doc-pull-through.md
- instructions/dev/stack-dev/SKILL.md
- instructions/dev/testing-conventions.md
- instructions/dev/tracker-testing.md
- kb/gtd/INDEX.md
- kb/gtd/technik/Chemenu 8.0.0 freigeben.md
- kb/gtd/technik/Windows nativ unterstützen.md
- kb/index.md
- tools/CONTRACT.md
- tools/chemenu/commands/docs_verify.py
- tools/chemenu/commands/doctor.py
- tools/chemenu/commands/review_cmd.py
- tools/chemenu/commands/task_cmd.py
- tools/chemenu/config.py
- tools/chemenu/tasks/config.py
- tools/chemenu/tests/conftest.py
- tools/chemenu/tests/fixtures/sp/MANIFEST.json
- tools/chemenu/tests/fixtures/sp/api/health.json
- tools/chemenu/tests/fixtures/sp/api/projects.json
- tools/chemenu/tests/fixtures/sp/api/tags.json
- tools/chemenu/tests/fixtures/sp/api/tasks.json
- tools/chemenu/tests/fixtures/sp/seed-backup.json
- tools/chemenu/tests/record_sp_fixtures.py
- tools/chemenu/tests/sp_headless.py
- tools/chemenu/tests/test_doctor.py
- tools/chemenu/tests/test_review.py
- tools/chemenu/tests/test_sp_recorded.py
- tools/chemenu/tests/test_task_cmd.py
- tools/chemenu/tests/test_tasks_config.py
- tools/chemenu/tests/test_tracker_live.py
- tools/chemenu/tests/tracker_live.py
- tools/pytest.ini

tools/pytest.ini

@@ -1,3 +1,5 @@
 [pytest]
 pythonpath = .
 testpaths = chemenu/tests
+markers =
+    live_tracker: talks to a real tracker (Super Productivity, CalDAV); skips without one - instructions/dev/tracker-testing.md