Live staging test asks for 1,000 user policies per page, above the API's 500 limit #3943

The live staging test test_live_unauthenticated_users_round_trip_and_upgrade fails, and with it the push.yml deploy run for every merge to master.

Its _policy_ids helper in tests/integration/test_live_v2_policies.py lists a browser's saved policies with GET /v2/user-policies?limit=1000. The Public API caps limit at MAXIMUM_QUERY_LIMIT (500, policyengine_api/query_parameters.py), so the request gets 422 "Invalid API v2 request" where the test expects 200.

Impact

• "Deploy and test staging Cloud Run candidate" fails in run 38793955936, so the staging candidate is not promoted and every production step is skipped.
• That run carries Stage 12A: Sign-in identity and v1-anchored user associations #3891 and Relay simulation run stage and progress on computing economy responses #3916, which are merged but not deployed. Every later merge to master stops at the same step until this is fixed.
• The earlier run (38785854236) failed at the same job for a different reason: missing privileges for the v2 runtime role. Those have been granted on staging and production, and the signed-in lifecycle test now passes. This is the only remaining failure.

Fix

Ask for at most MAXIMUM_QUERY_LIMIT per page in _policy_ids.