Add diagnostics_channel subsystem

[Qard]

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[codecov]

Codecov Report

Merging #98 (fd6130c) into main (63c3f75) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #98   +/-   ##
=======================================
  Coverage   93.88%   93.88%           
=======================================
  Files          19       19           
  Lines         458      458           
=======================================
  Hits          430      430           
  Misses         28       28           

Impacted Files	Coverage Δ
lib/rules/subsystem.js	100.00% <ø> (ø)

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