Function exact_version 

fn exact_version(requirement: &str) -> &str

Strips the comparator from a cargo version requirement so it can be parsed as a concrete Version.

The workspace pins rmcp exactly (rmcp = { version = "=3.1.0" }), and detect_current_rmcp_version returns that requirement verbatim. semver::Version::parse rejects the leading =, so the monitor could never read an exactly-pinned workspace.