...rk package
- Introduce src/lakeflow_framework/ as a proper Python package with pyproject.toml
 (hatchling build); config/ and schemas/ bundled as package data
- Implement Strategy B (Workspace Files-first) resolver in config_resolver:
 load_framework_default_json resolves via Workspace Files → importlib.resources →
 local/config/ overlay; load_framework_schema returns an importlib.resources
 traversable for bundled JSON schemas
- Reduce src/*.py shims to thin re-exports from lakeflow_framework for backward compat
- Add contrib/ extension point with README and __init__ stub
- Add tests: test_package.py (import surface), test_strategy_b_resolver.py (resolver + schema)
- Update all internal imports across dataflow/, dataflow_spec_builder/, and support modules
- Add docs: ADR-0007 (package layout), ADR-0008 (Workspace Files-first resolver),
 deploy_wheel.rst, deploy_framework_overview.rst, contributor_contrib.rst;
 update all existing docs/ pages to reference lakeflow_framework imports