Function build_solution 

pub fn build_solution(
    args: &CliArgs,
    cwd: &Path,
    _root_names: &[String],
) -> Result<bool>

Build mode orchestrator for TypeScript project references.

This is the entry point for --build mode, which:

1. Loads the project reference graph
2. Determines build order via topological sort
3. Checks up-to-date status for each project
4. Compiles dirty projects in dependency order