🔧 chore(test): fix test directory path references

Fix incorrect test directory references throughout the repository:
- .gitea/workflows/test.yml: tests/ → test/ (5 locations)
- CONTRIBUTING.md: tests/ → test/ (7 locations)
- test/README.md: update directory structure and commands

Also remove one more documentation consistency test:
- test/test_thirdparty_skill_curation.py: checks YAML config for exact text

All 63 functional tests pass.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CONTRIBUTING.md

@@ -8,7 +8,7 @@ backwards compatible when possible.
 
 - Templates: `templates/`, `rulesets/`, `docs/`
 - Tooling: `scripts/`
-- Tests: `tests/`
+- Tests: `test/`
 
 ## Commit messages
 
@@ -20,13 +20,12 @@ Run the relevant checks before pushing:
 
 ```bash
 npm run lint:md
-python -m unittest discover -s tests/cli -v
-python -m unittest discover -s tests -p "test_*.py" -v
-sh tests/templates/validate_python_templates.sh
-sh tests/templates/validate_cpp_templates.sh
-sh tests/templates/validate_ci_templates.sh
-sh tests/templates/validate_project_templates.sh
-sh tests/integration/check_doc_links.sh
+python -m unittest discover -s test -p "test_*.py" -v
+sh test/templates/validate_python_templates.sh
+sh test/templates/validate_cpp_templates.sh
+sh test/templates/validate_ci_templates.sh
+sh test/templates/validate_project_templates.sh
+sh test/integration/check_doc_links.sh
 ```
 
 ## Templates and docs