- Refactor cli/build/graph.py to use cached metadata and dependency indices
for faster graph generation and cleaner separation of concerns
- Refactor cli/build/tree.py to delegate per-role processing to process_role()
and support parallel execution via ProcessPoolExecutor
- Add unit tests for graph helper functions and build_mappings()
under tests/unit/cli/build/test_graph.py
- Add unit tests for find_roles() and process_role() behaviour
under tests/unit/cli/build/test_tree.py
- Remove the old include_role dependency integration test which relied on the
previous tree.json dependencies bucket
For details see ChatGPT conversation: https://chatgpt.com/share/6926b805-28a0-800f-a075-e5250aab5c4a
