Update frame system API docs for the C++ SDK frame system client

[Shannon Bradshaw (shannonbradshaw)]

Source changes

• RSDK-14590, RSDK-14591, RSDK-14592 — viam-cpp-sdk#720: RobotClient::transform_pcd, a FrameSystem service client (get_frame_system_config, get_pose, transform_pose, transform_pcd), and $framesystem added to every C++ module's dependencies. Released in C++ SDK v0.42.0 (git tag --contains e72de4a: releases/v0.42.0).
• Documents: no DOCS ticket found (the three keys and their parent RSDK-14586 have none).

Docs changes

• docs/motion-planning/reference/frame-system-api.md:
  • The intro said Go module authors were "the one exception" who can use the frame system as a dependency. C++ module authors now can too.
  • "Method availability varies by SDK: Go exposes all four, while Python reaches GetPose through the motion service" was wrong. Python has had RobotClient.get_pose since v0.83.0 (the page's own GetPose section says so), TypeScript exposes all four, and the C++ client now does too.
  • "Service names" now has separate Go and C++ instructions. In C++, the frame system arrives in the dependencies under FrameSystem::public_name() without being listed in validate (as in the SDK's complex/base example).

How I found these

• Upcoming items cpp-sdk-framesystem-client and cpp-sdk-camera-default-reference-frame graduated on today's C++ release. Grep of transform_pcd, $framesystem, framesystem.PublicServiceName and C++ across docs/ and static/.
• Pre-PR checks: prettier (repo-local 3.2.5), markdownlint, vale 3.12.0, frontmatter_rules.py and make build-prod passed.

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[Eliza Farley (elizafarley)]

Docs review: Ready to merge

This PR updates the frame system API reference for the new C++ frame system client, and fixes the wrong statement about which SDKs have which methods. The only commit since the last review is 29e5c2f, a merge from main. It doesn't touch frame-system-api.md, so the page content matches what was reviewed and verified before: all three earlier findings are fixed, and every technical claim matches SDK source.

CI: Pending on the merge commit: htmltest and runner / vale (required), plus prettier, markdownlint, and the Netlify preview. Frontmatter, moved-files, and codespell checks pass. All checks passed on 7ed6f66. Merge once the required ones go green.

Docs health: No regressions

Verified against source (13 claims)

• C++ FrameSystem service has get_frame_system_config, get_pose, transform_pose, transform_pcd: viamrobotics/viam-cpp-sdk src/viam/sdk/services/framesystem.hpp:64,89,107,117 (releases/v0.42.0)
• FrameSystem::public_name() is $framesystem: viam-cpp-sdk src/viam/sdk/services/framesystem.cpp:11-14
• Every modular resource gets the frame system in deps without listing it in validate, only when there's a viam-server parent: viam-cpp-sdk src/viam/sdk/module/service.cpp:252-257
• Check-then-std::dynamic_pointer_cast pattern: viam-cpp-sdk src/viam/examples/modules/complex/base/impl.cpp:54-57
• C++ RobotClient exposes all four in v0.42.0: viam-cpp-sdk src/viam/sdk/robot/client.hpp:232,243,253,275
• C++ RobotClient::transform_pcd first appears in v0.42.0: absent from src/viam/sdk/robot/client.hpp at releases/v0.41.0
• Python RobotClient exposes all four: viamrobotics/viam-python-sdk src/viam/robot/client.py:691,710,754,802
• Python RobotClient.get_pose from v0.83.0: commit 514477fb4 (Fix different use of "remote" #1270), first in tag v0.83.0
• TypeScript client exposes all four: viamrobotics/viam-typescript-sdk src/robot/client.ts:1238,1245,1265,1330
• Go RobotClient exposes all four: viamrobotics/rdk robot/client/client.go:1182,1200,1235,1262
• Flutter robot client exposes none of the four: no matches under viamrobotics/viam-flutter-sdk lib/ (outside generated protos) on main
• machine.transform_pcd example name matches the Python method: viam-python-sdk src/viam/robot/client.py:802
• Go framesystem.PublicServiceName is $framesystem: viamrobotics/rdk robot/framesystem/framesystem.go:36

Automated review by Claude. Rerunning the review updates this comment.

[Shannon Bradshaw (shannonbradshaw)]

Thanks. All three are fixed in 7ed6f66:

• The availability sentence now says C++ exposes transform_pcd from v0.42.0. v0.41.1's client.hpp has the other three methods but not this one.
• It also says the Flutter SDK doesn't expose these methods on its robot client. I checked: Flutter has only the motion service's getPose.
• The C++ bullet now says the dependency is present only under a viam-server parent, so check that it exists and then std::dynamic_pointer_cast it, which matches the SDK's complex/base example.

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