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docs: async cleanup timing and from() for self-iterated streams (#4222)

Documents when a superseded run's work stops: a returned iterable closes on
supersede, a frame's onCleanup runs when something replaces it on screen
(never-committed runs at once), and waiting on that cleanup inside the
transition that replaces it deadlocks. The hybrid SSR example returns the
iterable instead of for-awaiting it.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KH23HGjpz2U8ZLcvBB3Pnx

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