PR-readiness fixes for ChordalGMRF#1

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timweiland wants to merge 7 commits intosamuelsonric:mainfrom

timweiland:pr-81-chordal

Commits on Apr 30, 2026

Switch to registered MooncakeSparse and drop stale CliqueTrees imports

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Restore sum(::SymTridiagonal) rrule

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Apply runic formatting to remaining files

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Document ChordalGMRF in the reference page

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Seed RNG in NegativeBinomial Poisson-limit test

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Fix ChordalGMRF AD test shadowing and overly broad logpdf rrule

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Bump docs Turing compat to 0.40-0.44

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