MIL-001 Repository foundation: baseline documents, project configuration, CI and Doxyfile

Business Case, Stakeholder Analysis, Project Plan and MIL-001 accepted
with review records; ADR-0001 and ADR-0002; pyproject.toml, .gitignore,
package skeleton, Doxyfile and Gitea CI workflow.

Task: MIL-001#1
Task: MIL-001#2
Task: MIL-001#3
Task: MIL-001#4
Task: MIL-001#5
Task: MIL-001#6

.gitignore

@@ -0,0 +1,33 @@
+# Byte-compiled and cache files
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.mypy_cache/
+.ruff_cache/
+.import_linter_cache/
+
+# Virtual environments
+.venv/
+venv/
+env/
+
+# Packaging, build and Doxygen output
+build/
+dist/
+*.egg-info/
+.eggs/
+
+# Coverage
+.coverage
+htmlcov/
+
+# Secrets and local configuration (personal tokens, never committed)
+.env
+.env.*
+!.env.example
+
+# Editors and operating system
+.idea/
+.vscode/
+.DS_Store
+Thumbs.db