feat: infrastructure — pyproject.toml, requirements-dev, conftest, pytest-cov

Ajoute pyproject.toml (pytest strict markers, coverage fail_under=55),
requirements-dev.txt (pytest-cov, pytest-xdist), et tests/conftest.py
avec fixtures partagées (dossier_minimal, dossier_complet, controle_cpam).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pyproject.toml

@@ -0,0 +1,22 @@
+[build-system]
+requires = ["setuptools>=68.0"]
+build-backend = "setuptools.backends._legacy:_Backend"
+
+[project]
+name = "t2a"
+version = "2.0.0"
+requires-python = ">=3.12"
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "--strict-markers -x -q"
+markers = ["integration: tests requiring Ollama"]
+
+[tool.coverage.run]
+source = ["src"]
+omit = ["src/viewer/templates/*"]
+
+[tool.coverage.report]
+fail_under = 55
+show_missing = true
+exclude_lines = ["pragma: no cover", "if __name__", "except ImportError"]