v1.6.0 — Session log repair & replay-safe imports

Highlights

• Replay-safe imports: the converter now emits paired step/start…step/end markers around every assistant message and tool event, so imported sessions no longer fail token-meter cold replay after a model switch (no matching step/start event).
• New: repair-sessions — scan the session store for replay damage (missing step pairing, stale chunk citations, seq gaps from rewritten-head + stale-cursor tails) and heal logs in place, validated by DSH's real token meter before any write. Available as CLI (dsh-codex-sync repair-sessions [--fix]) and slash command (/repair-sessions [--fix]). A .bak is kept next to every repaired log.
• npm test now auto-locates the dsh checkout for @deepseek-ai/* resolution (40 tests).

🇨🇳 中文说明 (Chinese Translation)

主要变化

• 导入即合规：转换器现在为每条 assistant 消息与工具事件补齐配对的 step/start…step/end 标记，导入的会话在切换模型后不会再触发 token meter 冷重放报错（no matching step/start event）。
• 新功能：repair-sessions —— 扫描会话存储中的三类重放损伤（缺 step 配对、失效的 chunk 引用、改写头+旧游标尾造成的 seq 缺口）并原地修复；写入前用 DSH 真实的 token meter 校验，每个修复过的日志旁保留 .bak 备份。CLI（dsh-codex-sync repair-sessions [--fix]）与斜杠命令（/repair-sessions [--fix]）均可使用。
• npm test 现在自动探测 dsh 安装目录以解析 @deepseek-ai/*（共 40 个测试）。