⚡ Bolt: Fix N+1 PR state checking bottleneck with concurrency

[xbmc4lyfe]

💡 What: Used ThreadPoolExecutor and executor.map to batch concurrent _pr_is_still_open GitHub CLI calls instead of sequentially.
🎯 Why: supervisor sweeps and _fan_out_all_prs face an N+1 API call bottleneck for checking state across many PRs.
📊 Impact: Speeds up supervisor loops and PR fan-outs.
🔬 Measurement: Verify with tests and benchmarking the gh process execution times in fan-out runs.

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PR created automatically by Jules for task 7106734245347539146 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 cd3ea23.

📒 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-perf-concurrency-7106734245347539146

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch bolt-perf-concurrency-7106734245347539146

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