chore(verify): emit report-only entry/exit p99 deltas (#55)

Add an entry/exit price p99 delta line to verify_corpus's report-only (not
gated) block, alongside the existing p100. Gating is unchanged (still p90), so
corpus tiers are byte-identical; this only surfaces the tail of the price-delta
distribution for diagnostics and for the scraped-strategy tracking dashboard
(grade-corpus-tiers parses it into entryP99/exitP99).

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: luisleo526

scripts/verify_corpus.py

@@ -703,6 +703,7 @@ def _split_interior(pairs: list[tuple[TradePair, TradePair]]) -> list[tuple[Trad
             f"  PnL         p90 delta: {pnl_p90    * 100:8.4f}%  ({check(pnl_ok)})\n"
             f"  MAE         p90 delta: {mae_p90    * 100:8.4f}%  ({check(mae_ok)})\n"
             f"  -- report-only (not gated) --\n"
+            f"  Entry/Exit  p99 delta:  {percentile(entry_deltas,0.99)*100:.4f}% / {percentile(exit_deltas,0.99)*100:.4f}%\n"
             f"  Entry/Exit/PnL p100:   {entry_p100*100:.4f}% / {exit_p100*100:.4f}% / {pnl_p100*100:.4f}%\n"
             f"  Qty   p90/p100 delta:  {percentile(qty_deltas,0.90)*100:.4f}% / {qty_p100*100:.4f}%\n"
             f"  PnL%  p90/p100 (pts):  {percentile(pnlpct_deltas,0.90):.4f} / {pnlpct_p100:.4f}\n"