Gate the server too, and stop reading go test with grep

The commit hook had nine steps and not one of them touched the server. Every
server change for a week -- twenty-five commits, including the ad detectors and
the thing that publishes skips -- went in on somebody remembering to type "go
test" and reading the output. That is exactly the habit the Gradle wrappers
exist to replace, in the half of the repo nobody had wrapped.

go-verify reports from exit codes and parsed `go test -json`: gofmt, build, vet
and a real test count. It was watched catching both failures that look like
success in a terminal -- a failing test, named; and a package that fails to
compile, where go test exits non-zero with no failing test and the count
silently drops from 366 to 356.

366 is a number I did not have until now, because "go test ./... | grep -v ok"
cannot produce one.

It runs first in the hook, because ten seconds before the Android build beats
several minutes after it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B

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