feat(api): rebase JP's session turns/streams backend onto v0.105.5#5375

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mmabrouk wants to merge 3 commits into

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sessions-rebase/backend

Commits on Jul 19, 2026

feat(sessions): rebase session turns/streams backend onto v0.105.5
mmabrouk
committed
fix(sessions): model span_id as a 16-hex OTel id, not a UUID
mmabrouk
committed
fix(sessions): compute turn_index per turn and 409 duplicate appends
mmabrouk
committed