[KonradBreitsprecherBkd]

Extend unit and integration tests for code sections the coverage job reported as uncovered. Areas that are about to be reworked (trace/replay config, participant config, dashboard) were left out.

Area	New tests	Line coverage
Lifecycle states	ITest_Lifecycle (stop while paused), ITest_Abort (abort with pending async CommunicationReady), Test_LifecycleStates (drives the state machine directly: invalid/ignored transitions, restart, abort/stop chains, state names)	65% → 92%
LinController	ignored receptions, ignored SetFrameResponse calls, slave response on master-Tx ID, GetSlaveConfiguration, handler removal	66% → 85%
CommandlineParser of the utils (not the demos)	usage info, hidden arguments, PositionalList, accessors, parse errors	52% → 81%
CAN / Ethernet controllers	network simulator joins/leaves → detailed/trivial switch, rejecting messages not from the network simulator, handler removal	65% → 82% / 78% → 94%
Wall clock coupling	ITest_WallClockCoupling: coupled participant paces the simulation, lagging async completion catches up	coupling thread, catch-up and lag paths fully covered

Instructions for review / testing

cmake --preset coverage && cmake --build --preset coverage
ctest --preset coverage -L 'unit|integration'

• Before: 155 tests, total line coverage 63.0%.
  After: 158 tests, all pass; total line coverage 64.0%.

Please look closely at ITest_WallClockCoupling: it only asserts lower bounds of the elapsed wall clock time (a slow CI runner can only make a run longer), the upper bound is the 30 s harness timeout. It passed 40/40 runs with the CPU oversubscribed 2x (slowest run 0.7 s), and the pacing test fails as expected without coupling.

Blast radius: CI time (about +2 s), tests only.

Developer checklist (address before review)

• Changelog.md updated
• Prepared update for depending repositories
• Documentation updated (public API changes only)
• API docstrings updated (public API changes only)
• Rebase → commit history clean
• Squash and merge → proper PR title