Convenience wrappers around the build and workflow steps.

• build.sh [preset] configures and builds a CMake preset (default: release).
• test.sh builds and runs the full test matrix: release (GCC), ASan + UBSan, and a Clang release pass if clang++ is present.
• demo.sh runs the end-to-end CLI workflow (synth, validate, run, replay, report) in a temporary directory and prints the run id and event log hash.
• build_python.sh builds the pybind11 module and copies it into python/btos/ so import btos works.
• run_app.sh builds the Python module if needed and launches the Streamlit app.

All scripts are shellcheck-clean and resolve paths relative to the repository root, so they can be run from anywhere.