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

tests/test_broker.py

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+"""Pure tests for bracket level math (long + short). No network."""
+
+from __future__ import annotations
+
+import pytest
+
+from execution.broker import bracket_levels
+
+
+def test_long_levels_ordered():
+    side, entry, stop, take = bracket_levels(100.0, 0.07, 0.15, "long")
+    assert side == "buy"
+    assert stop < entry < take
+    assert (stop, take) == (93.0, 115.0)
+
+
+def test_short_levels_inverted_and_ordered():
+    side, entry, stop, take = bracket_levels(100.0, 0.07, 0.15, "short")
+    assert side == "sell"
+    # short: profit below (take), loss above (stop)
+    assert take < entry < stop
+    assert (take, stop) == (85.0, 107.0)
+
+
+def test_tiny_take_does_not_invert_long():
+    # adaptive buffer keeps entry inside the band even when take_pct is small
+    side, entry, stop, take = bracket_levels(100.0, 0.10, 0.03, "long")
+    assert stop < entry < take