DATA-02 provider identity pre-write guard validation

branch: dev/next-development
baseline: 2b79a6c4f761017efd45724feb5d0e0f5de897c5
production actions: none

pytest affected paths: 131 passed in 468.71s
SQLite repository zero-residual: 1 passed in 187.71s
incremental mypy: 0 regressions in 13 production files
full mypy debt ceiling: 0 errors in 0 files
migration drift: No changes detected in app data_center
Django system check: 0 issues
Ruff/Black/isort: 20 files passed
architecture: 3216 files, 0 boundary violations
current-data contracts: 63 surfaces passed
Celery contracts: 92 tasks, 21 exemptions, 23 governed files passed
governance: registry 2026-09-21.v149, 0 violations

evidence sha256: 677e5708c440cd5d7038465fc2a8c3029b72376baed010ffbfb3c5ec063d83f7

Actual PostgreSQL zero-residual/concurrency, 5,533-asset scale, numeric tolerance
and genuine production authority remain explicit DATA-02 gates.
