[AZ-219] Scaffold onboard runtime project

Add the initial source, test, infrastructure, CI, configuration, and evidence-path scaffold so dependent implementation tasks have stable package and runtime boundaries.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -1 +1,42 @@
 .DS_Store
+.venv/
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.coverage
+htmlcov/
+*.egg-info/
+
+.env
+.env.*
+!.env.example
+*.pem
+*.key
+*.secret
+
+data/input/*
+data/cache/*
+data/fdr/*
+data/test-results/*
+data/expected/*
+!data/input/.gitkeep
+!data/cache/.gitkeep
+!data/fdr/.gitkeep
+!data/test-results/.gitkeep
+!data/expected/.gitkeep
+
+*.tlog
+*.ulg
+*.bag
+*.mcap
+*.cbor
+*.parquet
+*.mp4
+*.mov
+*.avi
+*.jpg
+*.jpeg
+*.png
+!_docs/00_problem/input_data/**