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// Core execution engine - zero allocations
400">"text-blue-400">pub 400">"text-blue-400">fn 400">"text-yellow-200">execute_buffer_mutation(
    400">"text-purple-400">ctx: &400">"text-blue-400">mut 400">"text-yellow-300">EditorContext,
    400">"text-purple-400">mutation: 400">"text-yellow-300">BufferMutation,
) -> 400">"text-yellow-300">Result<(), 400">"text-yellow-300">EngineError> {
    400">"text-blue-400">let start_time = 400">"text-yellow-300">Instant::400">"text-yellow-200">now();
    
    400">"text-blue-400">match mutation {
        400">"text-yellow-300">BufferMutation::Insert { pos, text } => {
            ctx.buffer.400">"text-yellow-200">insert(pos, &text);
            ctx.indexer.400">"text-yellow-200">notify_change(pos, text.400">"text-yellow-200">len());
        },
        400">"text-yellow-300">BufferMutation::Delete { range } => {
            ctx.buffer.400">"text-yellow-200">delete(range);
        }
    }

    // Enforce sub-10ms response guarantee
    400">"text-blue-400">if start_time.400">"text-yellow-200">elapsed().400">"text-yellow-200">as_millis() > 10 {
        400">"text-purple-400">tracing::400">"text-purple-400">warn!(400">"Frame drop detected");
    }

    400">"text-yellow-200">Ok(())
}