fix: Gate hub close sync and trade record open stop-loss snapshot

Sync order monitors from Gate position history after hub flat close. Store and display initial_stop_loss in trade records instead of post-amend exchange stops.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_gate_position_history_lib.py

@@ -0,0 +1,26 @@
+from gate_position_history_lib import pick_gate_position_close, unified_symbol_for_match
+
+
+def test_unified_symbol_strips_settle_suffix():
+    assert unified_symbol_for_match("BTC/USDT:USDT") == "BTC/USDT"
+
+
+def test_pick_gate_position_close_matches_symbol_side_and_time():
+    hist = [
+        {
+            "symbol_u": "SOL/USDT",
+            "side": "short",
+            "close_ms": 1_700_000_000_000,
+            "open_ms": 1_699_999_000_000,
+            "pnl": -1.25,
+            "sync_key": "SOL_USDT|1|short",
+        }
+    ]
+    hit = pick_gate_position_close(
+        hist,
+        "SOL/USDT:USDT",
+        "short",
+        opened_at_ms=1_699_999_500_000,
+    )
+    assert hit is not None
+    assert hit["pnl"] == -1.25

tests/test_order_monitor_display_lib.py

@@ -1,6 +1,7 @@
 from order_monitor_display_lib import (
     apply_order_price_display_fields,
     is_sl_breakeven_secured,
+    monitor_open_stop_loss,
     order_monitor_tpsl_needs_sync,
     resolve_live_tpsl_prices,
     sl_breakeven_from_exchange_tpsl,
@@ -26,6 +27,11 @@ def test_snapshot_stop_loss_prefers_initial():
     assert snapshot_stop_loss(None, 2.6) == 2.6
 
 
+def test_monitor_open_stop_loss_prefers_initial_snapshot():
+    row = {"initial_stop_loss": 64000, "stop_loss": 63200}
+    assert monitor_open_stop_loss(row) == 64000
+
+
 def test_snapshot_rr_ignores_current_stop_after_manual_move():
     rr = snapshot_rr(_calc_rr, "long", 2.726, 2.45, 2.65, 3.3)
     assert rr is not None