The op log is the source of truth, so stop keeping everything resident

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Importing 80,000 blocks killed outl on the iPhone: iOS jetsam shot the app on open because every block kept a live Yrs CRDT document resident for the whole session. The fix was to treat block text as what it already is, a projection of the op log, and rebuild it on demand. Half a gig of RAM down to a few megabytes, why the rebuild is provably exact, and the replay peak nobody thinks about.

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