feat: implement immediate re-entry after closing position on reverse signal

- Added `_close_and_reenter` method to handle immediate re-entry after closing a position when a reverse signal is detected, contingent on passing the ML filter.
- Updated `process_candle` to call `_close_and_reenter` instead of `_close_position` for reverse signals.
- Enhanced test coverage for the new functionality, ensuring correct behavior under various conditions, including ML filter checks and position limits.

scripts/test_reverse_reenter.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/env bash
+# 반대 시그널 재진입 기능 테스트 스크립트
+# 사용법: bash scripts/test_reverse_reenter.sh [task]
+#
+# 예시:
+#   bash scripts/test_reverse_reenter.sh          # 전체 태스크 순서대로 실행
+#   bash scripts/test_reverse_reenter.sh 1        # Task 1: 신규 테스트만 (실패 확인)
+#   bash scripts/test_reverse_reenter.sh 2        # Task 2: _close_and_reenter 메서드 테스트
+#   bash scripts/test_reverse_reenter.sh 3        # Task 3: process_candle 분기 테스트
+#   bash scripts/test_reverse_reenter.sh bot      # test_bot.py 전체
+#   bash scripts/test_reverse_reenter.sh all      # tests/ 전체
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+
+VENV_PATH="${VENV_PATH:-$PROJECT_ROOT/.venv}"
+if [ -f "$VENV_PATH/bin/activate" ]; then
+    # shellcheck source=/dev/null
+    source "$VENV_PATH/bin/activate"
+else
+    echo "경고: 가상환경을 찾을 수 없습니다 ($VENV_PATH). 시스템 Python을 사용합니다." >&2
+fi
+
+cd "$PROJECT_ROOT"
+
+TASK="${1:-all}"
+
+# ── 태스크별 테스트 이름 ──────────────────────────────────────────────────────
+TASK1_TESTS=(
+    "tests/test_bot.py::test_close_and_reenter_calls_open_when_ml_passes"
+    "tests/test_bot.py::test_close_and_reenter_skips_open_when_ml_blocks"
+    "tests/test_bot.py::test_close_and_reenter_skips_open_when_max_positions_reached"
+)
+
+TASK2_TESTS=(
+    "tests/test_bot.py::test_close_and_reenter_calls_open_when_ml_passes"
+    "tests/test_bot.py::test_close_and_reenter_skips_open_when_ml_blocks"
+    "tests/test_bot.py::test_close_and_reenter_skips_open_when_max_positions_reached"
+)
+
+TASK3_TESTS=(
+    "tests/test_bot.py::test_process_candle_calls_close_and_reenter_on_reverse_signal"
+)
+
+run_pytest() {
+    echo ""
+    echo "▶ pytest $*"
+    echo "────────────────────────────────────────"
+    python -m pytest "$@" -v
+}
+
+case "$TASK" in
+    1)
+        echo "=== Task 1: 신규 테스트 실행 (구현 전 → FAIL 예상) ==="
+        run_pytest "${TASK1_TESTS[@]}"
+        ;;
+    2)
+        echo "=== Task 2: _close_and_reenter 메서드 테스트 (구현 후 → PASS 예상) ==="
+        run_pytest "${TASK2_TESTS[@]}"
+        ;;
+    3)
+        echo "=== Task 3: process_candle 분기 테스트 (수정 후 → PASS 예상) ==="
+        run_pytest "${TASK3_TESTS[@]}"
+        ;;
+    bot)
+        echo "=== test_bot.py 전체 ==="
+        run_pytest tests/test_bot.py
+        ;;
+    all)
+        echo "=== 전체 테스트 스위트 ==="
+        run_pytest tests/
+        ;;
+    *)
+        echo "알 수 없는 태스크: $TASK"
+        echo "사용법: bash scripts/test_reverse_reenter.sh [1|2|3|bot|all]"
+        exit 1
+        ;;
+esac
+
+echo ""
+echo "=== 완료 ==="