Document MessagePack (msgpack) encoding (#1342)

[MessagePack](https://msgpack.org/) is a binary encoding similar to CBOR. Add to the registry how to encode this in MCAP files.
foxglove · Mar 5, 2025 · b6344b4 · b6344b4
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diff --git a/cspell.config.yaml b/cspell.config.yaml
@@ -69,6 +69,7 @@ words:
   - matplotlib
   - mcap
   - msgdef
+  - msgpack
   - nanos
   - nanosec
   - noenv

diff --git a/website/docs/spec/registry.md b/website/docs/spec/registry.md
@@ -38,6 +38,10 @@ The Channel `message_encoding` field describes the encoding for all messages wit
 
 - `message_encoding`: [`cbor`](https://cbor.io/)
 
+### msgpack
+
+- `message_encoding`: [`msgpack`](https://msgpack.org/)
+
 ### json
 
 - `message_encoding`: [`json`](https://www.json.org/json-en.html)
-Original file line number
+Diff line change
@@ Expand Up / @@ -69,6 +69,7 @@ words: @@
       - matplotlib
       - mcap
       - msgdef
+      - msgpack
       - nanos
       - nanosec
       - noenv
@@ Expand Down @@