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jsonv2 now returns an error when you marshal or unmarshal a time.Duration without an explicit format flag. This is an intentional, temporary choice until the default [time.Duration] representation is decided (see golang/go#71631). setting.Snapshot can hold time.Duration values inside a map[string]any, so the jsonv2 update breaks marshaling. In this PR, we start using a custom marshaler until that decision is made or golang/go#71664 lets us specify the format explicitly. This fixes `tailscale syspolicy list` failing when KeyExpirationNotice or any other time.Duration policy setting is configured. Fixes #16683 Signed-off-by: Nick Khyl <nickk@tailscale.com>