chore(sdk): restore v0.18 API diff acknowledgement

Signed-off-by: Tjark Gunnar Rasche <trasche@nvidia.com>

Author: tjrasche

pkg/client/v1/api-diff-exceptions.yaml

@@ -14,4 +14,11 @@
 
 # Intentional API compatibility breaks. Each entry is tied to the active release
 # baseline and must be removed when that baseline advances; stale entries fail the gate.
-acknowledgements: []
+acknowledgements:
+  - baseline: v0.18.0
+    issue: '#1891, #2095'
+    summary: BundleOptions and Snapshot gained []byte fields, making both structs non-comparable.
+    rationale: BinaryAttestation enables verified in-image provenance; Raw preserves agent-emitted snapshots without dropping fields unknown to the client.
+    incompatible_changes:
+      - 'BundleOptions: old is comparable, new is not'
+      - 'Snapshot: old is comparable, new is not'