⚡ Bolt: optimize PR filtering with concurrency

[xbmc4lyfe]

💡 What: Replaced the sequential _pr_is_still_open loop in _filter_to_still_open_prs with a concurrent execution using concurrent.futures.ThreadPoolExecutor.
🎯 Why: Sequential subprocess calls to gh pr view for each open PR create a significant N+1 performance bottleneck when managing multiple PRs.
📊 Impact: Reduces the total time required to filter open PRs in the supervisor loop by performing the checks concurrently (up to 10 workers), significantly speeding up the fan-out process.
🔬 Measurement: Supervisor loop cycle time with multiple PRs will be reduced; verify by checking logs for the fan-out spawn duration.

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PR created automatically by Jules for task 6898533227700168946 started by @xbmc4lyfe

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Review details

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: f766d4f5-e58c-4a37-ad7c-8912f271c85b

📥 Commits

Reviewing files that changed from the base of the PR and between 7b35ed2 and ecf0adc.

📒 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-concurrent-pr-filter-6898533227700168946

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-concurrent-pr-filter-6898533227700168946

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