chore: clean up workspace for production

- Remove tracked generated artifacts: backtest logs (52), xlsx (43),
  experiment model pkls (7), ml_v3 training logs (11), result csv/txt
- Remove junk files: stray =1.4.5, training_output.log, *_analysis_output.txt,
  dead api.log, runtime bot.lock
- Remove throwaway scripts: analyze_performance, test_trajectory_bug, verify_settings
- Move reusable analysis scripts to scripts/analysis/
- Move status/report docs to docs/reports/
- Tighten .gitignore to prevent re-adding generated artifacts; ignore .kiro/

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