Add experimental support for MSC4360: Sliding Sync Threads Extension#19005

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devonh wants to merge 15 commits intodevelopfrom

devon/ssext_threads

Commits on Oct 1, 2025

Commits on Oct 2, 2025

Commits on Oct 7, 2025

Only return rooms where user is currently joined
devonh
committed

Commits on Oct 8, 2025

Commits on Oct 9, 2025

Allow SlidingSyncStreamToken in /relations
devonh
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Commits on Oct 10, 2025

Add indexes to improve threads query performance
devonh
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Commits on Oct 16, 2025

Move constants to designated file
devonh
committed

Commits on Oct 17, 2025

Don't fetch bundled aggregations if we don't have to
devonh
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