chore: update gitignore — untrack .claude/, ignore runtime data & logs

- Untrack .claude/settings.local.json (IDE-specific)
- Gitignore: data/bot_status.json, signal_persistence.json, model_metrics.json
- Gitignore: logs/ (all content, not just *.log)
- Gitignore: backtests/.claude/
- Add scripts/check_trade_detail.py utility
- Update data/risk_state.txt to current state

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -41,9 +41,8 @@ env/
 *.swo
 *~
 
-# Logs (keep structure, ignore content)
-logs/*.log
-logs/**/*.log
+# Logs (ignore all content)
+logs/
 
 # Data files (large)
 data/market_data/
@@ -86,6 +85,13 @@ archive/
 bot.pid
 bot_output.log
 nul
+data/bot_status.json
+data/signal_persistence.json
+data/model_metrics.json
+
+# Claude Code local settings
+.claude/
+backtests/.claude/
 
 # Screenshots
 *.png