The cache no longer fans changes out through an R3 Subject. It keeps a
copy-on-write observer array and Publish catches per observer: every observer
receives every change, an exception that escapes (a fail-fast R3 handler) joins
the OnUpdate failures rethrown to the writer after delivery, and the observer
stays subscribed. Dispose completes observers, and a disposed cache completes
new ones at once. Deletes the false "OnNext does not throw" comment.
The composition contract now states the observer policy and that a throwing
name or index getter refuses a change set, loads included.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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