Function discover_project_root

src/config.rs:674–697

Walks from `start` upward looking for an initialised repo marker (`.tracedecay/tracedecay.db`) or a profile-storage enrollment marker (`.tracedecay/enrollment.json`). Returns the first ancestor directory (inclusive) that contains an initialised `TraceDecay` project, or `None` if the filesystem root is reached without finding one. # Canonical project-root resolution order This walk-up is the hea

(start: &Path)

///    wins, then the shallowest registered descendant; ties are reported as
///    ambiguous and require an explicit path.
pub fn discover_project_root(start: &Path) -> Option<PathBuf> {
    let mut dir = start.to_path_buf();
    let worktree_root = crate::worktree::git_worktree_root(start);
    loop {
        if has_project_database(&dir)
            || crate::storage::has_enrollment_marker(&dir)
            || crate::storage::resolve_layout_for_current_profile(&dir).is_ok_and(|layout| {
                layout.storage_mode == crate::storage::StorageMode::ProfileSharded
                    && layout.graph_db_path.exists()
            })
        {
            return Some(dir);
        }
        if worktree_root
            .as_ref()
            .is_some_and(|root| paths_same(&dir, root))
        {
            return None;
        }
        if !dir.pop() {
            return None;
        }
    }
}

/// Like [`resolve_path`], but when `path` is `None` it walks up from `cwd`
/// to find the nearest initialised `TraceDecay` project before falling back to