Preserve aggregation candidates during root merging - #6750
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Root aggregation merges now carry an explicit role: leaf fan-in remains bounded by
segment_size, while root fan-in retains every leaf candidate until existing finalization performs the final prune. Focused coverage exercises leaf pruning, the leaf-to-root transition, root candidate preservation, and repeatable equivalent merges.Tests:
python3 .hprun/consumer-contract-6676.py(consumer-contract and author-contract; 3 passed each)bash .hprun/diff-check-6676.sh(1 passed)/usr/bin/rustfmt --check --edition 2024 quickwit/quickwit-search/src/collector.rs quickwit/quickwit-search/src/root.rs(passed)make fmtencountered an unrelated author-sandbox baseline failure: nightly rustup is unavailable and the unchanged license-header script has CRLF line endings.Generated with OpenAI GPT-5.6 Sol via Codex.