gradle-report: a missing report is a failure, not a pass

The lint path was wrong -- AGP writes to app/build/reports/, not app/build/ --
and the script fell back to the gradle exit code, printing
'report: MISSING ... result: PASS'. A checker that cannot find what it is
meant to check and passes anyway is precisely the failure these wrappers
exist to prevent, and it hid real lint errors in Listen for one run.

Now locates the report rather than assuming a path, and a missing report fails
while saying the check did not actually inspect anything.

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

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