Add Labcyte Echo Support

[alexjamesgodfrey]

Summary

Draft support for Labcyte (acq Beckman) echo support under PyLabRobot's v1b1 architecture.

I only have the echo 650 so this will be tailored to that specific machine for now.

This includes:

• Echo driver/frontend for Medman SOAP-over-HTTP calls
• lock/unlock, instrument info, DIO/access-state polling, and event stream support
• source/destination plate access operations and safe close-door handling
• source plate map upload, plate survey, saved survey retrieval, and dry plate support
• raw DoWellTransfer execution for existing Echo protocol XML via do_well_transfer() and EchoTransferPrintOptions
• focused tests for Echo RPC serialization/parsing, access state normalization, survey helpers, transfer execution, and plate-access behavior

Todo

• Add pylabrobot.labcyte namespace
• Add EchoDriver, EchoPlateAccessBackend, and Echo frontend
• Implement Echo Medman SOAP-over-HTTP transport
• Handle gzip-compressed responses and Echo request quirks
• Add instrument setup/teardown path
• Add GetInstrumentInfo
• Add lock/unlock/session control
• Add DIO/access-state polling
• Normalize source/destination access state
• Add source plate present/retract operations
• Add destination plate present/retract operations
• Add safe close_door() behavior
• Add generic PLR plate_access capability
• Wire Echo into PlateAccess
• Add event stream parsing/reading support
• Add source plate map upload
• Add PlateSurvey
• Add GetSurveyData
• Add DryPlate
• Add survey_source_plate() helper workflow
• Add SetSurveyData
• Add transfer-volume metadata helpers
• Add raw DoWellTransfer execution
• Add EchoTransferPrintOptions
• Parse Echo transfer report XML
• Add focused unit tests for access, survey, events, and raw transfer execution
• Add user docs for Echo access, survey, and transfer execution
• Run focused pytest validation
• Run focused ruff validation
• Fast-forward local checkout to PR head: git pull --ff-only
• Run or document live validation for the expanded survey/transfer path
• Add PLR-native Echo protocol generation from PLR resources/wells
• Add a higher-level transfer(...) API instead of requiring raw Echo protocol XML
• Model Echo source/destination load positions as PLR resources or PlateHolders
• Integrate physical plate movement with PLR arms/workcells
• Add examples for robot loads plate -> Echo surveys/transfers -> robot unloads plate
• Decide how Echo transfer results should update PLR liquid trackers
• Add broader docs explaining what is Echo-native vs PLR-native

Validation (WIP)

• uv run --with pytest --with pytest-timeout python -m pytest pylabrobot/labcyte/echo_tests.py pylabrobot/capabilities/plate_access/plate_access_tests.py
• uv run --with ruff ruff check pylabrobot/labcyte pylabrobot/capabilities/plate_access