docs: agnocast support (#372)

* docs: agnocast support

Signed-off-by: atsushi421 <atsushi.yano.2@tier4.jp>

* fix

* fix

---------

Signed-off-by: atsushi421 <atsushi.yano.2@tier4.jp>

Author: atsushi421

docs/design/software_architecture/.pages

@@ -3,3 +3,4 @@ nav:
     - caret_trace: caret_trace.md
     - caret_analyze: caret_analyze.md
     - tilde.md
+    - agnocast.md

docs/design/software_architecture/agnocast.md

@@ -0,0 +1,13 @@
+# Agnocast Support
+
+[Agnocast](https://github.com/tier4/agnocast) is a rclcpp-compatible true zero-copy IPC middleware. CARET has been extended to support applications using Agnocast as an alternative to DDS, enabling the use of CARET's existing [runtime recording](../runtime_processing/runtime_recording.md), [tracepoint filtering](../runtime_processing/tracepoint_filtering.md), and analysis capabilities with Agnocast-based systems. The usage of CARET remains unchanged when working with Agnocast-based applications.
+
+Please refer to the following PRs for the implementations:
+
+- [tier4/caret_trace#316](https://github.com/tier4/caret_trace/pull/316) - Runtime recording for Agnocast
+- [tier4/caret_trace#318](https://github.com/tier4/caret_trace/pull/318) - Trace filtering for Agnocast
+- [tier4/caret_analyze#577](https://github.com/tier4/caret_analyze/pull/577) - Agnocast data processing and analysis
+
+## Version Compatibility
+
+CARET supports only Agnocast versions later than [2.1.2](https://github.com/tier4/agnocast/releases/tag/2.1.2).