- auth.py: _create_access_token had no jti claim, so two refreshes
within the same wall-clock second produced byte-identical access
tokens (same failure mode already fixed for refresh tokens earlier)
- test_refresh_endpoint.py: usernames (jwttoken, refreshuser, etc.)
collided with test_auth_endpoints.py's own test usernames once run
in the same pytest session against a shared DB with no per-test
isolation -- exactly how run_checkpoint_tests.py invokes pytest.
Namespaced this file's usernames with a refep_ prefix.
Full backend suite (63 tests) passes clean end-to-end against a real
Postgres with real migrations applied.
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