scripts/analyze_e4_d_to_p.py loads E1 / E3 / E4 summary.json + E4's
metrics.jsonl, prints latency / TTFT / per-decode-load side-by-side,
breaks E4 down by execution_mode (so the reseed-mode improvement vs
E3 can be isolated), and emits PASS/FAIL verdicts for H1 and H3 from
the protocol.
