Code review fixes:
- Renamed misleading exportIncrementalDolt to hasDoltChanges (now just checks for changes)
- Extracted stageJSONLFiles() helper to eliminate duplication
- Extracted runJSONLExport() helper
- Removed unused Actor field from ExportState (add back when implementing filtering)
- Consolidated hookPreCommitDoltFallback into doExportAndSaveState
- Added updateExportStateCommit for no-change fast path
Net reduction: 44 lines (-116/+72)
Added tests for:
- getWorktreeHash
- Export state paths
- Save/load export state
- JSON serialization with omitempty
- updateExportStateCommit
- computeJSONLHashForHook
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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