Constant FM_EXPECTED_FEDIMINTD_VENDOR_ENV 

pub const FM_EXPECTED_FEDIMINTD_VENDOR_ENV: &str = "FM_EXPECTED_FEDIMINTD_VENDOR";

Expected vendor when devimint compares fedimintd --version with DKG/setup.

fedimintd --version is its Cargo package version, so it does not include the optional vendor passed to fedimintd::run at runtime. DKG/setup reports the normalized version with +vendor; set this environment variable so devimint can reconstruct and compare that semantic version exactly. This preserves testing of exact vendor identity instead of stripping SemVer build metadata.

_ENV names this Rust constant; the environment variable is FM_EXPECTED_FEDIMINTD_VENDOR.