Function preflight_database_discovery 

pub(crate) fn preflight_database_discovery(
    db: &Path,
    config_path: Option<&Path>,
    isolated_binding: bool,
) -> Result<Option<ProjectStateGuard>, CliError>

Admit root discovery using selection available before SQLite metadata reads.

Explicit startup storage outside a known selected namespace is an isolated operator binding. Its basename alone does not grant automatic ownership.