loadProjectWireDump function
Loads the PROJECT-level trajectory: section's wireDump flag from
<projectDir>/.fah/config.yaml (issue #385). Null when the file or the
section is absent/unreadable; a present-but-invalid section throws
ConfigException (strict, like the user config).
Implementation
bool? loadProjectWireDump(String projectDir) =>
loadProjectTrajectorySection(projectDir)?.wireDump;