cleanup tests

[nbassler]

No description provided.

[Copilot]

Pull request overview

This PR modernizes and simplifies the test suite by removing legacy “all-in-one” test programs, adding small focused test executables, and extending CI with an install/consumer smoke test plus a dedicated Valgrind job.

Changes:

• Remove legacy test drivers (tests/test.c, tests/loadTest.c) and rely on one-test-per-file executables.
• Add new smoke tests for workspace initialization and config loading, plus an install+consumer check via a CMake script.
• Update CI to fail on CTest failures and run Valgrind in a separate job; refresh VS Code project settings accordingly.

Reviewed changes

Copilot reviewed 17 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/test_pstar.c	Update reference comment to point to NIST PSTAR source.
tests/test_load_configs.c	New config-loading smoke test across several program/ion/target combinations.
tests/test_initialize.c	New workspace allocate/free smoke test.
tests/test_icru73_old.c	Add reference provenance comment for ICRU73 old parametrization.
tests/test_icru73.c	Add reference provenance comment for ICRU73.
tests/test_icru49.c	Add reference provenance comment for ICRU49.
tests/test_icru.c	Add comment describing ICRU alias behavior.
tests/test_astar.c	Add NIST ASTAR reference comment.
tests/test.c	Remove large legacy test runner.
tests/loadTest.c	Remove legacy “loadTest” driver used by old CTest entries.
tests/install_smoke_test.cmake	Add CMake-driven install/build + consumer compile/run smoke test.
tests/install_consumer.c	Add a tiny “installed headers + link + runtime” consumer program.
tests/CMakeLists.txt	Switch to globbed test_*.c executables + add test_install_consumer.
.vscode/settings.json	Switch to CMake Presets and adjust language-server notes.
.vscode/launch.json	Remove legacy loadTest debug config; adjust working directory.
.vscode/extensions.json	Small formatting/cleanup of extension recommendations.
.github/workflows/ci.yml	Make CTest failures fatal; move Valgrind into a separate job.

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