Small refactor / simplification

[Soph]

Entire-Checkpoint: af494d0087bc

[cursor]

PR Summary

Low Risk
Small internal refactor that centralizes existing write-path logic; behavior should remain the same aside from potential subtle error-path/permission propagation differences.

Overview
Refactors transcript restoration during rewind to remove duplicated logic when checkpoint/shadow-commit data includes agent exportData (e.g., OpenCode).

Both restoreSessionTranscriptFromStrategy and restoreSessionTranscriptFromShadow now delegate to a shared helper, writeSessionWithExportData, which resolves the transcript path, ensures directories exist, and invokes agent.WriteSession for combined file write + native import.

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[Copilot]

Pull request overview

This PR performs a refactoring to eliminate code duplication by extracting common logic into a helper function. The changes extract identical code blocks from two functions (restoreSessionTranscriptFromStrategy and restoreSessionTranscriptFromShadow) that both handle session restoration with export data.

Changes:

• Extracted duplicated session restoration logic into new helper function writeSessionWithExportData
• Both caller functions now invoke this helper instead of duplicating the implementation
• Minor comment update for consistency