⚡ Bolt: Optimize $O(N^2)$ list inclusion checks in case extraction

[mapleleaflatte03]

💡 What: Refactored blocked_peer_host_ids and blocking_commitment_ids in kernel/kernel/cases.py and intelligence/company/meridian_platform/cases.py to use a set for ID tracking rather than a list.

🎯 Why: The original implementation used an $O(N)$ list inclusion check (not in seen) inside an $O(N)$ loop over blocking cases, resulting in an $O(N^2)$ algorithmic complexity. As the number of blocking cases grows, this repeated array scanning could significantly degrade runtime performance. Using a set brings the inclusion check down to $O(1)$ and avoids the quadratic scaling, returning the expected sorted list at the end.

📊 Impact: Reduces time complexity of unique value extraction from $O(N^2)$ to $O(N \log N)$ (due to sorting), providing measurable overhead reduction on case-heavy workspaces and preventing potential CPU saturation when iterating through hundreds of cases.

🔬 Measurement: Verified correctness by running existing test suites (kernel/kernel/tests/test_cases.py and intelligence/company/meridian_platform/test_cases.py), ensuring that standard functionality was preserved. Profiling scratchpads confirmed overhead reduction in array scanning loops.

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PR created automatically by Jules for task 2464437084165330556 started by @mapleleaflatte03

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