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AI-generatedVala GLib.DateTime local wall-clock parsing during DST overlap
Goal: diagnose which instant Vala selects when converting an offset-less local wall-clock timestamp to UTC through GLib.DateTime during a DST fall-back overlap, where one local time can map to two UTC instants. Constraint: Vala relies on the host system's tzdata via GLib.TimeZone and does not expose an explicit disambiguation parameter in the standard DateTi