uavcan.node.GetInfo service client scanner in CyphalApp

[emrainey]

Summary

Add the client side of uavcan.node.GetInfo.1.0 (port-ID 430) to CyphalApp: intermittently scan a range of server node-IDs (e.g. 2..10), send GetInfo requests, and log the responses that come back.

Builds on the server-side service infra (i.e. the UdpardRxServiceDispatcher from the server issue):

• Register a service response RX port for port-ID 430 (udpvRxServiceDispatcherListen(..., is_request=false, ...)).
• Maintain per-(service-ID, server-node-ID) transfer-ID counters for the request/response rendezvous.
• Periodically (e.g. every ~5 s or on a slow scan cycle) send a GetInfo request to the next node-ID in the scan window using udpardTxRequest and the same MTU/deadline patterns as PublishHeartbeat.
• On a completed response whose source node matches the pending scan: deserialize, print name / version / unique-id.

Tests

• Unit tests for request serialize (empty payload), response round-trip; test the scan schedule/target selection logic factorized if feasible; lag a test plan + mock for the rendezvous (not host-testable behind hypha/ethernet).

Depends

Server-side service infra from the server issue (id #44).

[emrainey]

Progress: implemented the GetInfo client scanner.

• Added GetInfoScanner (scan window, wrap-around cursor, per-node transfer-IDs, pending tracking) — host-tested.
• CyphalApp now registers a response RX port for service 430 and routes dispatcher transfers by direction; sends sealed GetInfo requests via udpardTxRequest on a 5 s tick; gathers + deserializes responses.
• Added bare-metal memmove (overlap-safe memory::move + extern wrapper) in modules/memory because udpardGather needs it for the M7 link.
• PR nucleo-cyphal: add uavcan.node.GetInfo client scanner (issue #45) #47 opened against develop (stacked on nucleo-cyphal: serve uavcan.node.GetInfo (430) via libudpard RPC dispatcher #46). LLVM/AppleClang hosts 18/18 green, M4/M7 cross builds.