KOPR R130 WPLANNER PERFORMANCE REFERENCE

PRODUCTION BOUNDARY
- EphemGen() and PlotGen() create immutable operations on the shared background QThread runner.
- No QApplication.processEvents() and no direct heavy compute in wplanner.py.
- Progress is signal-routed; elapsed time uses QTimer.

JOB AND PROCESS OWNERSHIP
- One operation owns at most one spawn pool.
- Workers do not create nested pools.
- One job owns one comet/apparition interval.
- Each job performs at most one forward and one backward integration.
- Element batches use one vector Astropy frame transform.

DEFERRED PERSISTENCE
- Fitting, validation, compression and writing use one bounded background worker.
- Persistence failure, queue saturation or shutdown timeout cannot invalidate a completed ephemeris.
- Cold covered interval: 1 integration. Warm covered interval: 0 integrations.

DETERMINISTIC SCENARIOS
- 1 comet x 4 midnights: 1 job / 1 worker.
- 1 comet x 500 epochs: 1 job / 1 worker.
- 4 comets x 300 epochs: 4 jobs / 4 workers.
- 300 comets x 4 epochs: 300 jobs / 4 workers.

SCIENTIFIC NON-REGRESSION
No change to DE440s, Cowell/DOP853, element selection, light-time, topocentric geometry, provenance or Cancel semantics. WStack remains serial and isolated.

QA
1767 passed, 8 skipped, 0 failed. Manifests: 342 QA / 95 CLEAN.