Function resolve_dependency 

pub fn resolve_dependency(
    dep_id: &str,
    current_repo_specs_dir: &Path,
    repos: &[RepoConfig],
) -> Result<Spec>

Resolves a spec dependency ID (local or cross-repo) and returns the spec.

Handles both local dependencies (without repo prefix) and cross-repo dependencies with the repo:spec-id format.

Arguments

• dep_id - The dependency ID string (e.g., “2026-01-27-001-abc” or “backend:2026-01-27-001-abc”)
• current_repo_specs_dir - Path to the current repo’s .chant/specs directory
• repos - List of configured repositories

Returns

The resolved spec, or an error if resolution fails