[reno-]

Pause and Escape previously left ISF feedback/FRAMEINDEX and external input pictures advancing. Render stalls also advanced shader TIME by at most 250 ms and show/media clocks by at most 2 s, accumulating drift. Snapshot composition fades advanced in wall time while layer fades followed show speed.

This holds source/effect frames at Pause or speed zero, latches Escape until explicit GO/Play/recall or releasing Pause, and preserves an independent operator Pause. Blackout and manual output faders remain available in wall time. Running show/media clocks and shader TIME catch up to elapsed wall time; shader TIMEDELTA keeps a bounded integration step. Missed simulation frames are not replayed. Snapshot composition and layer fades now share show time.

The endurance analyzer adds --check with nonzero exit on callback/lock budget violations, control drops, decoder errors, lost or incomplete telemetry. It reports peak tracked memory and lifetime callback/lock percentiles, rejects inactive audio and counter resets, and requires a fresh process for qualification.

Validation: application and engine tests compile on macOS; 19 local CPU/widget CTest areas pass after rebuilding all targets, the clock regressions also pass ASan/UBSan (leak detection disabled), and seven analyzer tests pass, including CLI exit codes. New GPU regressions cover persistent feedback hold/resume, external-input consumption, paused snapshot composition fades, blackout while held, and TIME versus TIMEDELTA across 650 ms / 3.1 s stalls. Linux CI passes all 65 CTest tests, including show_hold and the packaged application smoke test. Workspace ASan, ThreadSanitizer, the UI scenario and fuzzing also pass. Windows engine tests have passed and packaging is in progress; macOS engine tests are still running. The PR remains draft pending the remaining platform results. The exhaustive ISF library render remains disabled.

The single docs/README.md removes the completed show-control definition task and retains actual outstanding profiling, physical endurance/receiver acceptance and color transforms. No hardware performance or receiver A/V claim is made.