pub fn discover_platform_tools_stdlib_roots() -> Vec<PathBuf>Expand description
Locate every platform-tools/rust/lib/rustlib/src/rust/library/ tree
under ~/.cache/solana/ and return them newest-version-first. Empty
vec if the solana toolchain isn’t installed via agave-install.
Callers pair these with CI_PLATFORM_TOOLS_PREFIX so stdlib frames
emitted against the CI build path resolve to the local source tree.