Fix file occupation exception by addressing root cause with forced GC and retry logic#100

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Copilot wants to merge 6 commits intomasterfrom

copilot/fix-file-occupation-exception

Commits on Jan 12, 2026

Initial plan
Copilot
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Fix file occupation exception by using File.Move with File.Copy fallback

Copilot
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JusterZhu
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Delete source file after File.Copy to maintain consistency with File.Move behavior

Copilot
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JusterZhu
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Address root cause: Force GC and add retry logic with exponential backoff to handle file handle release delays

Copilot
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JusterZhu
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Address code review feedback: delete temp file, use async Task.Delay, remove unused variable

Copilot
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JusterZhu
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Remove unnecessary Task.Run wrapper and GC calls from retry loop, clarify comments

Copilot
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JusterZhu
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