Fix reconstruction unavailable: SIGALRM timeout only on main thread (Gradio runs callbacks in worker threads)

Interactive mechanism selector: reconstruct + inspect posterior per chosen mechanism

Switch demo to calibrated RQ-NSF (no sbi, fast load/sampling); add synthetic test examples; trim reconstruction cost

SPARK v4 outer-sphere ET demo (continuous-manifold model + alternative mechanisms)

Rebrand TRACE -> SPARK

Phase-2 joint image+waveform models + From-Image hybrid pipeline

Add OOD detection (CV+TPD), 9 CV / 11 TPD ID demos + 4 CV / 2 TPD OOD demos, scan-rate doc

Initial TRACE deployment: rebrand from ECFlow + noise-aug headline checkpoints