[CLEANUP] Flatten Glimmer reference hot paths (each item cells, inlined track frame, property refs)#21435

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NullVoxPopuli-ai-agent:perf/each-item-cell-ref

Commits on May 29, 2026

perf(reference): make {{#each}} item params cheap "cell" references

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Commits on Jun 1, 2026

perf(reference): flatten track() frame and {{#each}} key resolution

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perf(reference): flatten childRefFor to a data-driven Property reference

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perf(validator): pool trackers and lazily allocate the consumed-tag Set

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perf(validator): fast path tag [COMPUTE] for subtag-less tags

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