Function default_dsh_credentials_path 

pub fn default_dsh_credentials_path() -> PathBuf

Default DeepSeek Harness credentials document, resolved without probing.

Matches dsh-credentials-local: $DSH_HOME/.credentials.yaml, or ~/.dsh/.credentials.yaml when DSH_HOME is unset. Consent is pinned to this exact path; a later DSH_HOME change is reported, never followed.