feat: Add DigestUpsertRequest and LockEntity models

- Introduced DigestUpsertRequest for handling digest upsert requests with properties like ChannelId, Recipient, DigestKey, Events, and CollectUntil.
- Created LockEntity to represent a lightweight distributed lock entry with properties such as Id, TenantId, Resource, Owner, ExpiresAt, and CreatedAt.

feat: Implement ILockRepository interface and LockRepository class

- Defined ILockRepository interface with methods for acquiring and releasing locks.
- Implemented LockRepository class with methods to try acquiring a lock and releasing it, using SQL for upsert operations.

feat: Add SurfaceManifestPointer record for manifest pointers

- Introduced SurfaceManifestPointer to represent a minimal pointer to a Surface.FS manifest associated with an image digest.

feat: Create PolicySimulationInputLock and related validation logic

- Added PolicySimulationInputLock record to describe policy simulation inputs and expected digests.
- Implemented validation logic for policy simulation inputs, including checks for digest drift and shadow mode requirements.

test: Add unit tests for ReplayVerificationService and ReplayVerifier

- Created ReplayVerificationServiceTests to validate the behavior of the ReplayVerificationService under various scenarios.
- Developed ReplayVerifierTests to ensure the correctness of the ReplayVerifier logic.

test: Implement PolicySimulationInputLockValidatorTests

- Added tests for PolicySimulationInputLockValidator to verify the validation logic against expected inputs and conditions.

chore: Add cosign key example and signing scripts

- Included a placeholder cosign key example for development purposes.
- Added a script for signing Signals artifacts using cosign with support for both v2 and v3.

chore: Create script for uploading evidence to the evidence locker

- Developed a script to upload evidence to the evidence locker, ensuring required environment variables are set.

docs/airgap/samples/av-report.sample.json

@@ -0,0 +1,23 @@
+{
+  "$schema": "../av-report.schema.json",
+  "scanner": "clamav",
+  "scannerVersion": "1.4.1",
+  "startedAt": "2025-12-02T00:02:00Z",
+  "completedAt": "2025-12-02T00:04:30Z",
+  "status": "clean",
+  "artifacts": [
+    {
+      "path": "chunks/advisories-0001.tzst",
+      "sha256": "1234123412341234123412341234123412341234123412341234123412341234",
+      "result": "clean",
+      "yaraRules": []
+    },
+    {
+      "path": "chunks/vex-0001.tzst",
+      "sha256": "4321432143214321432143214321432143214321432143214321432143214321",
+      "result": "clean",
+      "yaraRules": []
+    }
+  ],
+  "errors": []
+}