Remove xc from TwoStageDecimator test

[Allan-xmos]

remove HW timer, rename

[Copilot]

Pull request overview

This PR converts the TwoStageDecimator test from XC (XMOS C) to C++ by removing the main.xc file and consolidating all functionality into app.cpp. The PR description mentions removing the "HW timer" and renaming, though the actual changes are broader than just that.

Changes:

• Removed main.xc file entirely, consolidating XC code into app.cpp
• Converted parallel XC constructs to C++ PAR_JOBS/PJOB macros
• Updated CMakeLists.txt to set dependencies directly instead of including deps.cmake

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/signal/TwoStageDecimator/src/main.xc	Deleted XC file containing main() and host_words_to_app()
tests/signal/TwoStageDecimator/src/app.cpp	Added main() and host_words_to_app(), converted to C++ with PAR_JOBS pattern
tests/signal/TwoStageDecimator/CMakeLists.txt	Simplified dependencies by removing deps.cmake include
Jenkinsfile	Updated Jenkins shared library version from v0.45.0 to v0.46.0

Comments suppressed due to low confidence (2)

tests/signal/TwoStageDecimator/src/app.cpp:14

• The include for xcore/hwtimer.h is not used in this file. No hwtimer functions are called anywhere in the code. This unused include should be removed to keep the code clean and avoid unnecessary dependencies.
  tests/signal/TwoStageDecimator/src/app.cpp:181
• The PAR_JOBS macro waits for all jobs to complete before continuing. However, the host_words_to_app function runs in an infinite loop (SELECT_RES with continue), so it will never complete. This means the code at lines 183-186 will never execute, and the program will hang after the run function completes. In the original XC code, the program would exit explicitly when run completed, terminating all parallel tasks. To fix this, you should call exit(0) within the run function after process_signal completes, similar to the original XC implementation.

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