An XAUUSD-focused Python + MT5/MQL5 research architecture built around immutable opportunities, append-only JSONL persistence, restart reconstruction, explicit terminal outcomes and fail-closed ambiguity. Published evidence is dry-run/research evidence, not a live-performance claim.
A recorded dry-run collection processed four decision journals across four demo-account contexts. The run scanned 3,697 records, processed 240 schema-v2 completed-candle observations and persisted 20 approved opportunities.
These numbers describe research-pipeline behavior and idempotent persistence, not trading profitability.
The same research sequence later exposed an outcome-model flaw: market and pending-entry states were not being distinguished correctly. The pilot was classified INVALIDATED_RESEARCH_PILOT, excluded from statistics and archived instead of being presented as valid evidence.
Deterministic identifiers, append-only writes, conflict detection and record-integrity checks.
Outcome state is rebuilt from persisted opportunity and event history rather than hidden in memory.
Unknown or overlapping timelines remain ambiguous instead of being forced into a result.
Published dry-run evidence explicitly reports runtime wiring and order-send state.
The source tree contains the MT5 executor, broker gate and account-bound gateway. The captured four-account demo runtime remained order-send disabled or blocked, so Build 212 publishes that limitation instead of converting implementation capability into a fake fill claim.
Shows the account-binding re-check before mt5.order_send(), TRADE_RETCODE_DONE fill requirement, broker request construction and read-side history gateway.
Summarizes opportunity/outcome JSONL, four isolated Tickmill-Demo runtime journals, recovery observations and the explicitly invalidated research model with account identifiers removed.
AUREUS is presented as a deterministic trading-research and execution architecture. The dry-run artifacts above validate data handling, persistence and safety behavior; they are not audited returns, a recommendation, or a guarantee of future performance.