Fix double Dispose in use bindings with as patterns (#12300)#19858

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fix/issue-12300

Commits on May 29, 2026

Add failing tests for use-binding double dispose (#12300)

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Fix double-dispose in `use a as b = d` (#12300)

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Suppress duplicate Dispose when `use` rhs aliases a use-bound val (#12300)

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Format, expert-review fixes, and release notes for #12300

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Add PR link to release notes for #12300

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