Merge pull request #9 from SongshGeo/dev

docs(tech-stack): 📝 Add initial tech stack documentation outlini…

Author: SongshGeo

cache/tech-stack.md

@@ -0,0 +1,10 @@
+# Tech Stack
+
+## Develop Env Stack
+
+- Python 3.10–3.13 (PEP 563 via `future-annotations`, typing support via `typing-extensions`).
+- Poetry build (PEP 621) with runtime deps only `typing-extensions`, `future-annotations`.
+- Tooling via pre-commit: Black (code + Jupyter), Isort (`--profile=black`), Ruff lint/format, Flake8 (custom ignores/line length), nbstripout (keep outputs), check-ast/EOL/trailing-space.
+- Quality gates: Mypy (`--ignore-missing-imports`), Interrogate (docstring coverage fail-under 80), docstrings follow Google style.
+- Testing harness: Pytest; task orchestration: Tox; notebooks: ipykernel/ipywidgets.
+- Versioning/releases: Google Release Please automation.