⚡ Bolt: Replace .filter().collect() with manual loop and preallocated Vec in children_of

[ovasylenko]

💡 What: Replaced the .filter(...).collect() iterator chain in orch8-engine/src/evaluator.rs:children_of with a manual for loop pushing to a Vec instantiated with Vec::with_capacity(8).

🎯 Why: Because .collect() on a filter adapter doesn't know the final size in advance, it starts with a capacity of 0 (or a very small allocation) and reallocates memory as items are pushed. Pre-allocating a small baseline capacity skips these initial reallocation overheads in an execution hot path called repeatedly during state evaluation.

📊 Impact: Reduces memory reallocation overheads in a heavily used function.

🔬 Measurement: Verified by ensuring all tests pass via cargo test -p orch8-engine --lib evaluator::tests.

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PR created automatically by Jules for task 589442603582692870 started by @ovasylenko

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