Match rounded money for close-first entries and opening margin calls

[luisleo526]

Apply TradingView's rounded signal-cost check when an opposite entry follows a same-bar close. Use rounded required money at the existing opening-margin checkpoints, including before a priced exit. The pinned May 28 trim becomes 62.32 instead of 62.28; the June 9 opening now includes the missing one-unit margin call.

Validation on engine c63be8880c49576300b2a53d1889a2e1c34dfb29 with codegen 3fd97fe28abd7b191cb376d9f5db4e056fcfae4b:

• Cloud Run: 72/72 cases, all 4,190 probes measured. Demete and willow EURUSD convert from strong to excellent, with 100% canonical matching and zero canonical trade-count gap. Their PnL P90 remains 0.0005 and 0.0006.
• Gate pineforge-pr-gate-xsrx6: PASS, zero regressions or tolerances across 704 hard probes, target two-band score +2. No tier drops or new moderate; result is 4,147 excellent / 42 strong / 1 moderate.
• 202 C++ unit tests and the C ABI check passed. Independent Grok review of this exact combined commit: GREEN, P0/P1/P2 = 0.

Taro EURUSD remains strong and unresolved: its canonical match rate changes from 97.6% to 97.5% and PnL P90 from 0.0009 to 0.001, while the canonical trade-count gap improves from 5 to 3. These mixed metrics are retained explicitly.

Candidate snapshot: 1fccc6441684a1a75911ec16e8f9e0477b0b6a1213788280f8735be56eacf92a (788,867 bytes), compared with baseline engine ff4a6b897b66a97d78a7c5aa8ca4b02b6804bd94.