research(nightly): SymphonyQG — graph-coupled 4-bit FastScan neighbor scoring#443

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research/nightly/2026-05-08-symphony-qg

Commits on May 8, 2026

feat(symphony-qg): add ruvector-symphony-qg crate — graph-coupled 4-bit FastScan neighbor scoring
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docs(nightly): ADR-193 + research doc for SymphonyQG (2026-05-08)
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