⚡ Bolt: Replace HashSet with Vec for block IDs tracking during output compaction

[ovasylenko]

💡 What:
The collect_body_block_ids function in orch8-engine/src/evaluator.rs was allocating and cloning Strings (BlockId) into a HashSet on the hot execution path when compacting iteration outputs. I replaced HashSet with Vec<&BlockId> and adjusted the iteration to use .sort_unstable(), .dedup(), and .binary_search().

🎯 Why:
String allocation and hashing have a measurable overhead in hot loops. During loop iterations where we do output compactions, cloning large numbers of identifiers hurts throughput. Replacing the map with a zero-allocation vector reference lookup bypasses this constraint and mirrors performance principles observed in orch8-engine where similar optimizations exist.

📊 Impact:
Eliminates O(N) heap allocations for block ID collection entirely on loop body traversal. Based on comparable operations in rust, avoiding String cloning combined with .binary_search is markedly faster for smaller block tracking limits than a clone-heavy Hashset map.

🔬 Measurement:
Testing confirms exact behavioral compatibility passing cargo test -p orch8-engine --lib evaluator::tests.

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PR created automatically by Jules for task 14973451970852441863 started by @ovasylenko

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