feat(skyhook): pos_fn introspection for SKH01 sleeve (current open trade / flat)

_skyhook_positions(): replays the non-overlap entry+exit logic (TP/SL/max_bars) to the last
closed 230m bar and reports, per asset, the current OPEN trade (dir/entry/sl/tp/bars_in) or
'flat'. Wired into skyhook_sleeve(pos_fn=...) so the Deribit book report & web dashboard show
Skyhook's live position. Causal (closed bars only). +1 test. Currently flat/flat.

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

tests/test_skyhook.py

@@ -129,6 +129,16 @@ def test_short_override_changes_only_shorts():
     assert longs_same > 0 and shorts_diff > 0
 
 
+def test_skyhook_pos_fn_structure():
+    """pos_fn introspettiva: dict BTC/ETH, ciascuno 'flat' o dict con dir/entry/sl/tp coerenti."""
+    from src.portfolio.sleeves import _skyhook_positions
+    pos = _skyhook_positions()
+    assert set(pos.keys()) == {"BTC", "ETH"}
+    for a, p in pos.items():
+        assert p == "flat" or (isinstance(p, dict) and p["dir"] in ("LONG", "SHORT")
+                               and p["sl"] > 0 and p["tp"] > 0 and 0 <= p["bars_in"] <= p["max_bars"])
+
+
 def test_v2dd_robust_both_assets():
     """SKH01-V2-DD: PASS netto fee su BTC&ETH, hold-out forte, e maxDD standalone <30%."""
     import skyhooklib as sk