* Fix incorrect DOM order with conditional ContextProvider and inner keys (#5065) (#5067)

When a VNode is moved via INSERT_VNODE during diffChildren, its old _dom
pointer becomes a stale positional reference. Nested diffs that call
getDomSibling would traverse the old VNode tree and find this stale _dom,
causing subsequent DOM insertions at the wrong position.

Clear the old VNode's _dom after insert so getDomSibling skips moved
VNodes and finds the correct insertion point.

* Create a unique event-clock for each Preact instance on a page. (#5068)

* Fix migrations when we have defaultValue or value on a textarea (#5081)

* Add CODEOWNERS for GitHub configuration (#5088)

* chore: remove unused Fragment import in forwardported test