- Introduced GraphNodeSummary and GraphPlanSummary structures for build graph representation.
- Implemented preview_build_graph function to generate a summary of the build graph.
- Refactored configuration parsing to improve handling of boolean values and inheritance of lists.
- Added unit tests for build graph preview and configuration parsing.
I still don't know how to write tests.
Currently the build flow still calls the legacy build_*_command helpers, so selecting --toolchain doesn’t change behavior yet; the new interface is inert scaffolding until builder.v switches to it.
Joca