36e05233d0
Side StrEnum (long/short/flat), frozen dataclasses con calcolo unrealized_pnl per Position e gross/fees/net_pnl per Trade (fees in basis point, default 5bp). 4 test TDD passing, ruff + mypy strict clean. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>