Let a runtime-owned state grow past the document limit

A list's stored form is one value in the tree store, so the limit on a
document (1.38 MiB, what a host carries whole as an HTTP body) capped a
table at about 51,000 rows of 28 bytes. A value the runtime owns, a state
(a key starting with '.') or a draft without a key, may now grow to 1 GiB;
documents keep their limit. The store's format is unchanged: its trees
already reach far past either.

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