Run Robot Framework suites on stations

Robot Framework joins pytest and OpenHTF as a first-class test framework on TofuPilot stations.

• Added a native Robot Framework connector: each test case becomes a phase, with measurements from the shipped TofuPilot keyword library
• Detected .robot suites automatically when importing a repo, with a new Robot starter template
• Added end-to-end coverage with eight Robot scenarios alongside the existing pytest agent-protocol tests