The get_positions TTL cache (added for the speed fix) silently broke the
naked-stop guard: _broker_held_symbols read 2.5s-stale positions, so a
just-filled entry wasn't seen as held, the guard thought it was unfilled, and
cancelled its bracket on a price dip -> NAKED position (APWC bled -12.8%
unprotected today). Fixes:
- client.get_positions(fresh=True) bypasses the cache; the guard uses it.
- entry_grace_seconds (default 5): never cancel an entry within N seconds of
arming, so a marketable fill can confirm before the bracket could be stripped.
Regression test added.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
