Function read_adapter_binding 

pub fn read_adapter_binding(
    path: &Path,
    overlay: &HashMap<PathBuf, String>,
) -> Result<String>

An adapter’s .binding.ts module: overlay-first (an open, unsaved binding buffer), else a real disk read. Content-ownership track (#1086) scope note, found under slice 5’s implementation: unlike a project’s .bynk sources — enumerable ahead of time by extension, and this track’s actual charter — a binding module’s path is only known once its declaring adapter has been parsed (adapter … { binding: "…" }), so no discovery walk (bynk-testkit, bynk-driver::discovery) can pre-populate it into a sources map the way .bynk files are. Keeping a disk-read fallback here — the CLI’s real production path has always worked exactly this way, #1077/#1081 notwithstanding — is a deliberate, narrow carve-out, not a straggler.