Add remote stream selection command

[sena-neuro]

Summary

Add select <query> to the remote control TCP interface, where <query> is an LSL resolver predicate such as name='BioSemi' or type='EEG'.

This allows remote clients to select a subset of streams before starting a recording.

Why The Supporting Changes Are Included

Remote start previously selected all streams before recording. That would override any stream subset selected through select <query>, so remote start now records the current selection instead.

Starting a recording refreshes the stream list. To keep TCP-selected streams stable across that refresh, the selected state is preserved before rebuilding the list, and stream matching now uses source_id when available with a fallback for streams that do not provide one.

The stream list is rebuilt from both refresh and remote-selection paths, so the list rebuild logic is shared rather than duplicated.

Remote responses were tightened because start can now fail for normal remote-control reasons, such as no streams being selected.

Compatibility Notes

Remote start no longer implicitly selects all streams. Clients that need the previous behavior should send select all before start.

A valid query that matches no streams returns WARNING no streams matched and leaves the current selection unchanged. Clients that need a deterministic subset should send select none before select <query>.

Command parsing is exact and case-sensitive.

Validation

• Built the GUI target locally.
• Ran TCP interface tests on the validation branch.
• Ran a manual TCP smoke validation with synthetic LSL streams.

Smoke validation script:
https://gist.github.com/sena-neuro/ed12a2570c496ba0e43214fdf24029b4