test/helpers/paid-test-set.ts is now the one definition of which test
files are paid (the exact globs package.json's test:gate expands).
scripts/test-free-shards.ts derives its free/paid exclusion from it
instead of a private regex list, dropping the dead
browse/test/security-review-fullstack.test.ts pattern (file no longer
exists). The sharded paid runner derives its enumeration from the same
module, so a file added to one list can no longer silently miss the
other.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
(cherry picked from commit a7f36479a6a1f3656452370f5883371f3cb65623)
Garry Tan