fix(ros2_parser): strip namespace suffix instead of a fixed 5 chars

`CreateSchema()` used a hard-coded `substr(0, size - 5)` to strip
"::msg" from a message's C++ namespace to recover the package name.
That works for normal messages (`sensor_msgs::msg`) and happens to
work for services (`::srv` is also 5 chars), but it silently mangles
action-generated messages whose namespace ends in `::action` (8 chars).

For a topic like `<pkg>/action/<Action>_FeedbackMessage` the namespace
is `<pkg>::action`. Stripping exactly 5 chars from e.g.
`docking::action` (15 chars) leaves `docking::a` — exactly the
truncated package name reported in #1060. Downstream lookups then
fail with "package not found".

Replace the hard-coded strip with a suffix check over the three known
generator namespaces (`::msg`, `::srv`, `::action`). Each is stripped
by its actual length, so action feedback topics subscribe cleanly and
services stay unchanged.

Closes #1060.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ros_parsers/ros2_parser.cpp

@@ -102,7 +102,15 @@ std::string CreateSchema(const std::string& base_type)
         case ROS_TYPE_MESSAGE: {
           auto type_info = reinterpret_cast<const MessageMembers*>(member.members_->data);
           std::string package = type_info->message_namespace_;
-          package = package.substr(0, package.size() - 5);  // remove "::msg"
+          for (const std::string& suffix : { "::msg", "::srv", "::action" })
+          {
+            if (package.size() >= suffix.size() &&
+                package.compare(package.size() - suffix.size(), suffix.size(), suffix) == 0)
+            {
+              package.resize(package.size() - suffix.size());
+              break;
+            }
+          }
           const std::string field_type = fmt::format("{}/{}", package, type_info->message_name_);
           schema += field_type;
           if (secondary_types_done.count(field_type) == 0)