feat(execution): per-account Alpaca GTC brackets, guardrails, shorts, options, reconcile

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016DvdRZkyCy9NJpHYDdPqmS

execution/reconcile.py

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+"""Snapshot one persona's Alpaca account into the state DB (keyed by persona id), so the
+dashboard and the next nightly run (via get_portfolio) see that account's holdings + PnL.
+"""
+
+from __future__ import annotations
+
+from loguru import logger
+
+from execution.broker import Broker
+from state import db
+
+
+def _f(x, default=0.0) -> float:
+    try:
+        return float(x)
+    except (TypeError, ValueError):
+        return default
+
+
+def reconcile(db_path, account: str, broker: Broker) -> dict:
+    acct = broker.get_account()
+    positions = broker.get_positions()
+
+    pos_list = [
+        {
+            "symbol": p.symbol,
+            "qty": _f(p.qty),
+            "avg_entry": _f(p.avg_entry_price),
+            "market_value": _f(p.market_value),
+            "unrealized_pl": _f(p.unrealized_pl),
+        }
+        for p in positions
+    ]
+
+    con = db.connect(db_path)
+    db.record_snapshot(
+        con, account=account, equity=_f(acct.equity), cash=_f(acct.cash),
+        buying_power=_f(acct.buying_power), positions=pos_list,
+    )
+    for p in pos_list:
+        db.upsert_position(con, account=account, **p)
+    con.commit()
+    con.close()
+
+    logger.info("reconciled {}: equity=${:.2f} positions={}", account, _f(acct.equity), len(pos_list))
+    return {"account": account, "equity": _f(acct.equity), "positions": pos_list}