ciflow/trunk/199415: [memory_viz] Move initial pool summaries with their envelopes

发生了什么

Initializing reserved memory can move an already created pool envelope. The offset correction covered individually drawn blocks but left the summarized stripe at its old position, sometimes inside a different pool. Reposition the summary above the pool's drawn blocks after all initial reservations are known. Authored with an AI assistant (Codex). Test Plan node test/profiler/test_memory_viz.js source .venv/bin/activ…

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