Remove ClearDirtyIssues() which had a race condition that could lose
dirty issues if export failed partway through. All callers now use
ClearDirtyIssuesByID() which only clears specific exported issues.
- Remove from Storage interface
- Remove from SQLite and Memory implementations
- Update 6 test call sites to use ClearDirtyIssuesByID()
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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