3817566ed5
Post-review fix for Task 1: code reviewer flagged that
idx_users_v2_is_test_account didn't match the idx_users_<suffix>
convention used by every other index in user_store.py. The
implementation commit (d163675) was amended to use
idx_users_test_account; this commit updates the plan and spec
docs so they stay in sync.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>