chore(ci): enforce 95% code coverage threshold (#57)

* Initial plan

* Add 95% code coverage threshold to CI test job

Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: deviantintegral <255023+deviantintegral@users.noreply.github.com>

Author: Copilot

.github/workflows/ci.yml

@@ -24,6 +24,6 @@ jobs:
       - name: Type check
         run: uv run mypy src/
       - name: Test
-        run: uv run pytest --cov=flameconnect --cov-report=term-missing --tb=short
+        run: uv run pytest --cov=flameconnect --cov-report=term-missing --tb=short --cov-fail-under=95
       - name: Mutation test
         run: uv run mutmut run --max-children 4