- set OAuth2 authorization code `ValidUntil` on creation and add expiry
checks during exchange
- return a specific error when codes are invalidated twice to prevent
concurrent reuse
- add unit tests covering validity timestamps, expiration, and double
invalidation
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Generate by a coding agent with Codex 5.2
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Signed-off-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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