fix: retire disposed live ownership

[patrickleet]

Summary

Retire local live-query ownership when the last watch for a stream is disposed,
then let a later snapshot stream take over shared nested indexes. The runtime
keeps the retirement boundary in operation metadata so callbacks from a stream
that started before disposal remain fenced, while a stream started afterward
can populate the current page immediately.

User benefit

Navigation between pages that share nested relationship data no longer leaves
the new page stuck behind a disposed page's membership. The replacement page
can render its authorized snapshot without a refresh or polling workaround.

Scope and ordering

The boundary is scoped to one replica's live-operation lifecycle. It is local
runtime ownership/order metadata, not a server clock, projection position, or
claim that the server stopped producing events. Reopening an operation clears
the retired marker before synchronous transport callbacks arrive. Hydration
preserves retired boundaries and does not replace an already active receiver's
ownership.

Verification

• npm run build
• npm run check
• npm test — 384 passed, 0 failed
• Targeted ownership regressions — 7 passed, 0 failed
• git diff --check

Before the fix, the regression test snapshot live takes over a nested graph from a disposed page subscription failed with 0 !== 1: the disposed-page
owner continued to block the later snapshot stream.

User-facing copy

No user-facing copy was added.

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