Bug: 23 duplicate Telegram notifications with P&L compounding (-7.96 to -,129.24)
Cause: Multiple monitoring loops passed has() check before any deleted from Map
Fix: Use Map.delete() atomic return value as deduplication lock
Result: First caller deletes and proceeds, subsequent callers return immediately
Related: #48-49 (TP1 P&L compound), #59-61 (external closure duplicates)
Deployed: Dec 2, 2025 17:32:52 UTC (commit 93dd950)
702ef7953b