resolve_sdk_version() -> tuple[str | None, DistributionMetadataStatus]Resolve the diagnostic deepagents SDK version.
Compatibility wrapper for callers that only need one SDK version string and
lookup status. Every editable install carries an +editable local segment,
matching how the SDK stamps lc_versions["deepagents"]. For sibling monorepo
packages whose stable source marker trails dcode's exact SDK pin, the pin
identifies the nearest published baseline the workspace HEAD represents.