kaidokert / rm32 / 25229602347

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Make CRSF throttle_channel a const, add channel extraction test (#37)

* Make CRSF throttle_channel a const, add channel extraction test

throttle_channel was a pub struct field set to 2 and never modified.
Replace with pub const THROTTLE_CHANNEL: usize = 2.

Document the C/Rust convention difference (C uses index 1, Rust uses
index 2 — both refer to AETR channel 3 / Throttle).

Add test that builds a CRSF frame with a known value in channel 2,
parses it, and verifies the throttle mapping produces the correct
ESC throttle value (1034 for CRSF value 1000).

* Fix misleading comment about C channel index, clean up dead test code

The comment incorrectly claimed C index 1 mapped to the same channel
as Rust index 2. In fact, the C variable is declared but never used
(CRSF is behind an uncompiled flag). Updated comment to state this.

Remove dead payload construction code left over from test iteration.

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