Updated all copyright headers from "Lux Partners Limited" to "Lux Industries Inc" and updated the year to 2025 to reflect the new holding company structure.
* add context to SendAppRequest signature
* stop waiting on app response upon context cancellation
* add contexts in other network send functions
* crosschain cancellation
* app request cancellation
* app request any on cancellation
* fixes
* change ErrorContains to ErrorIs
* treat as fatal TODO
* use context
* simplify texts
* test nits
* comment; make responseChan buffer length 1
* update test
* peer: remove TODOs for treating appSender err as fatal