⚡ Bolt: Optimize PR state checks via concurrent execution

[xbmc4lyfe]

💡 What: Changed _filter_to_still_open_prs in cli.py to use concurrent.futures.ThreadPoolExecutor to check the state of multiple PRs in parallel instead of sequentially.
🎯 Why: Sequential gh pr view subprocess calls during fan-out create a significant N+1 performance bottleneck. By fetching PR states concurrently, supervisor startup and sync times are greatly reduced.
📊 Impact: Reduces time spent checking PR states by up to 10x (depending on the number of open PRs) by utilizing parallel subprocess calls with a maximum of 10 workers.
🔬 Measurement: Verify supervisor startup logs when many PRs are open. The overall time from fetching the initial list to spawning the children should be notably lower.

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PR created automatically by Jules for task 15702320531782394299 started by @xbmc4lyfe

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⚙️ Run configuration

Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b35ed2 and 03f5498.

📒 Files selected for processing (2)

• .jules/bolt.md
• ralph_loop/cli.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bolt/optimize-pr-state-checks-15702320531782394299

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt/optimize-pr-state-checks-15702320531782394299

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