Spec 436: Exchange content-backed evidence promotion (#503)
Summary: Wire Exchange PowerShell evidence capture through Spec 435 structured envelopes, target normalizers, and hash builder for transportRule, remoteDomain, and inboundConnector; preserve append-only internal content-backed evidence with fail-closed readiness, output, identity, and redaction behavior; add Spec 436 artifacts and focused coverage. Validation: php artisan test --filter=Spec436 --compact PASS, 28 tests / 307 assertions; git diff --cached --check PASS before commit. Product/Ops: Livewire v4 unchanged; provider registration unchanged under apps/platform/bootstrap/providers.php; global search unchanged; no destructive/high-impact actions; no assets/browser/UI/deployment impact.
Co-authored-by: Ahmed Darrazi <ahmed.darrazi@live.de>
Reviewed-on: #503
ahmido
30a6733f78