feat(zed): recover corrupted frame gaps in MCAP export

Make ZED MCAP export skip corrupted frame runs until recovery and

treat unreadable tail frames as end-of-stream instead of hard

failing conversion.

Update bundled nearest-mode export to emit partial bundles during

corruption gaps, extend BundleManifest with explicit member status

and skipped-frame counts, and only write payload messages for

present cameras.

Tighten batch probing so bundled MCAP validation checks /bundle

coverage and per-camera message counts, and improve failure

excerpts to include stderr tail output.

Also add a local cppzmq CMake fallback, refresh the multi-record

tester for the new bundle schema, and document the mixed NVENC

limitations in the README.

proto/cvmmap_streamer/BundleManifest.proto

@@ -0,0 +1,32 @@
+syntax = "proto3";
+
+package cvmmap_streamer;
+
+import "google/protobuf/timestamp.proto";
+
+message BundleManifest {
+  enum BundlePolicy {
+    BUNDLE_POLICY_UNKNOWN = 0;
+    BUNDLE_POLICY_NEAREST = 1;
+    BUNDLE_POLICY_STRICT = 2;
+  }
+
+  enum BundleMemberStatus {
+    BUNDLE_MEMBER_STATUS_UNKNOWN = 0;
+    BUNDLE_MEMBER_STATUS_PRESENT = 1;
+    BUNDLE_MEMBER_STATUS_CORRUPTED_GAP = 2;
+  }
+
+  message BundleMember {
+    string camera_label = 1;
+    google.protobuf.Timestamp timestamp = 2;
+    sint64 delta_ns = 3;
+    BundleMemberStatus status = 4;
+    uint32 corrupted_frames_skipped = 5;
+  }
+
+  google.protobuf.Timestamp timestamp = 1;
+  uint64 bundle_index = 2;
+  BundlePolicy policy = 3;
+  repeated BundleMember members = 4;
+}