The guard emitted nothing when it passed, so its success was indistinguishable
in the CI log from the step never running at all — the same silent-skip failure
mode it exists to catch, one level up. Confirmed on run 332: the job was green
and the log carried no trace of the step either way.
Each crate/target check and the canary now echo their result, followed by a
count and the exit code, so a reader can see the guard ran and what it proved.
Verified by extracting the run: block from the workflow and executing it
verbatim under bash -e: 4 checks, canary found, exit 0.
e3dc794a09