Add SD remote backup reseal support

[naga-rathin]

Adds SDK support and hardware test coverage for the foundational HSM SD remote-backup reseal API.

Changes

• Adds DDI hardware tests for remote-backup resealing.
• Adds public API roundtrip and re-randomization tests.
• Reuses the existing CreateSD provisioning flow.
• Adds policy-bound synthetic v2 KeyReports until firmware KeyReport generation and signature-chain validation are available.
• Verifies missing OOB metadata and tampered source backups are rejected.
• Keeps backup key seed material inside the HSM during resealing.

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[Copilot]

Pull request overview

Adds SDK- and test-level support for foundational HSM Security Domain (SD) remote-backup resealing, including new hardware-only integration tests and host-driver support for carrying TBOR out-of-band (OOB) payloads.

Changes:

• Add SdResealRemoteBackup hardware integration tests plus expanded SdCreateRemoteBackup hardware coverage using synthetic (unsigned) policy-bound v2 KeyReports.
• Refactor TBOR test harness provisioning fixtures (introduce reusable PotaFixture) and update spec-coverage documentation.
• Extend the Linux DDI backend to send TBOR OOB items via the driver’s data-transfer ioctl, enabling commands that require Metadata Page-backed OOB payloads.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
ddi/tbor/types/tests/SPEC_COVERAGE.md	Adds spec coverage mapping for SdCreateRemoteBackup and SdResealRemoteBackup (emu vs hw split).
ddi/tbor/types/tests/README.md	Documents how to run hardware reseal tests serially and warns about partition mutation/concurrency.
ddi/tbor/types/tests/harness/x509_fixture.rs	Introduces PotaFixture to reuse POTA root material and thumbprint for provisioning flows.
ddi/tbor/types/tests/harness/mod.rs	Makes x509_fixture available beyond emu builds.
ddi/tbor/types/tests/commands/sd_restore_local_backup.rs	Switches provisioning to PotaFixture to align with updated harness patterns.
ddi/tbor/types/tests/commands/sd_reseal_remote_backup_hw.rs	New hardware-only reseal tests that build synthetic v2 KeyReports from real sealing keys.
ddi/tbor/types/tests/commands/sd_create_remote_backup.rs	Adds hardware-only SdCreateRemoteBackup coverage and synthetic report generation path.
ddi/tbor/types/tests/commands/part_init/mod.rs	Removes emu-only gate on part_policy_with_pota to support hardware provisioning paths.
ddi/tbor/types/tests/commands/mod.rs	Registers the new hardware-only reseal test module under feature gating.
ddi/nix/src/dev.rs	Adds Linux driver data-transfer ioctl support for TBOR OOB payload forwarding.
ddi/mbor/test_helpers/src/report.rs	Adds fake_manticore_key_report_bytes helper for synthetic policy-bound v2 KeyReports.
api/tests/src/utils/sd_provision.rs	Updates sealing key + KeyReport helper to synthesize reports on hardware until TborKeyReport exists.
api/tests/src/sd/restore_tests.rs	Updates callsites for new masked_key_and_report(session, policy) signature.
api/tests/src/sd/restore_peer_tests.rs	Updates callsites for new masked_key_and_report(session, policy) signature.
api/tests/src/sd/restore_local_tests.rs	Updates callsites for new masked_key_and_report(session, policy) signature.
api/tests/src/sd/reseal_tests.rs	Exercises public API reseal flow using policy-bound report generation.
api/tests/src/sd/create_peer_tests.rs	Updates create-peer SD flows to use policy-bound report generation.
api/tests/src/sd/create_backup_tests.rs	Updates create-remote-backup SD flows to use policy-bound report generation.
api/tests/Cargo.toml	Adds azihsm_ddi_mbor_test_helpers dependency needed for synthetic report generation in tests.

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