copybot: close the orphan/cash-debit seam (HANDOFF proper fix, Option A)

Every drained buy fill is now recorded: the tok-match keeps _record_lag
(real lag/slippage), leftovers get a bet record synthesized from the fill
(_record_untracked_buy). check_book() asserts the book invariant after
every trade and at boot: my_pos token => bet record + conds entry + cash
debited. Records/conds self-correct; the cash leg heals only at boot and
only when ledger_drift matches one un-vouched position's cost+fee exactly
— anything else stays a visible ⚠ drift. my_pos entries now carry cond
(engine) and fills-ledger BUY lines carry token, so the book can always
self-attribute. reconcile_exits' drain no longer discards leftover buys.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

archive/copytrade.py

@@ -483,11 +483,16 @@ class CopyTrader:
         if is_add:
             mine["shares"] += res["filled_shares"]
             mine["cost"] += spent
+            if cond:
+                mine.setdefault("cond", cond)
         else:
+            # wallet/cond ride on the position so the book can always self-repair:
+            # wallet for the feed's my_pos->bets safety net, cond so check_book can
+            # rebuild the conds map (an orphan without it can never settle)
             self.state["my_pos"][token] = {
                 "shares": res["filled_shares"], "cost": spent,
                 "title": title, "outcome": outcome, "event": event,
-                "wallet": wallet}          # attribution for the feed's my_pos->bets safety net
+                "wallet": wallet, "cond": cond}
         tag = "[PAPER]" if not self.ex.live else "[LIVE]"
         self.alert(
             f"{kind} {label} — {tag} buy {res['filled_shares']:.1f} "