fix: drop unused import that failed the CI ruff gate (blocked image builds)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01B3PXXn2tHBzdv6rYtGPz86

research/daily_report.py

@@ -27,7 +27,7 @@ sys.path.insert(0, str(ROOT))
 os.environ["PG_SKIP_SCHEMA"] = "1"
 from dotenv import dotenv_values  # noqa: E402
 
-from research.live_scorecard import (TARGET_TRADES, bootstrap_mean_ci, config_drift, load_freeze,  # noqa: E402
+from research.live_scorecard import (bootstrap_mean_ci, config_drift, load_freeze,  # noqa: E402
                                      load_trades, verdict)
 
 ET = ZoneInfo("America/New_York")