* perf(fig): scope lazy page population work
- Limit override propagation and clone indexing to active page nodes
- Reuse clone membership sets instead of rebuilding them per subtree
- Coalesce Layers tree structural rebuilds during population
- Add a regression test that rejects document-wide scans
* fix(fig): preserve global override propagation
- Keep fill and child-placement propagation across clone lineages
- Retain scoped work only for passes proven independent of inactive pages
- Cover the two required global propagation scans
* perf(fig): finish scoped population review
- Stream active override candidates without temporary arrays
- Scope fallback clone maps when no lineage index is supplied
- Skip stale queued Layers tree rebuilds after synchronous refreshes
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