v3.1.1 — the log summary told the truth

The log summariser reported "no errors" when it had merely failed to find the Editor log. On the game-ci lane Unity streams to the job console instead of writing a file, so the logs artifact holds only a shader-compiler log.

It now names what it scanned and warns when the Editor log is absent, and stage 07 fetches each build job's log through the API — where Unity actually put the output.

Tags are lightweight on purpose.