Add comprehensive Architecture Decision Records (ADRs) detailing the
new shipment review state machine, review history domain, and customer
resubmission logic. This documentation establishes the separation
between operational shipment status and the review lifecycle.
Additionally, perform repository cleanup by removing obsolete Postman
collections, environment files, test scripts, and unused migrations.
- Add ADR-001 through ADR-005 regarding review workflow and state.
- Add shipment review handoff documentation.
- Remove redundant Postman resources and local environment configs.
- Remove `test_pdf_generation.php` and `resubmit-test.json`.
- Remove unused `shipment_packages` migration.
- Rename and reorganize one-off maintenance scripts.
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