distfiles: let the sync and the audit write to a parallel root - #242
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重建演练量不到 distfiles 那一段：正式流程会改写正式状态，所以无法在平行根上 执行。五处路径写死在正式位置——`distfiles-sync.sh` 的两个日志， `audit-distfiles.py` 的孤儿状态、回收目录与清理账本。 五处都改成可用环境变量覆盖，预设值保持现在的正式路径不变，沿用同一支脚本里 既有的写法。孤儿状态用 `ORPHAN_STATE` 而不是 `STATE`：`distfiles-sync.sh` 的 `STATE` 指的是 emirrordist 的状态目录，两者含义不同，同名会在演练里互相踩到。 `docs/recovery.md` 的 distfiles 那一节给出可照抄的隔离命令，并写明实测数字 仍待补。
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docs/recovery.md里 distfiles 的恢复时间是空的：正式流程会改写正式同步状态，所以那一段无法在平行根上演练。
五处路径写死在正式位置：
deploy/distfiles-sync.sh的--success-log与--failure-log，deploy/audit-distfiles.py的孤儿状态、回收目录与清理账本。五处都改成可覆盖，预设值保持现在的正式路径不变。
孤儿状态的环境变量取名
ORPHAN_STATE而不是STATE：distfiles-sync.sh已经用STATE表示 emirrordist 的状态目录，而这里指的是orphans.json档案，同名会让演练里两条命令互相踩到。
变异反证
五个覆盖点各注入一次，把读取覆盖那行改回写死，对应测试都转红：
ORPHAN_STATE、RECYCLE、LEDGER（test-audit-distfiles.py）、FAILURE_LOG、SUCCESS_LOG（test-distfiles-temp-device.py）。测试
本机全套 Python、Shell、JavaScript 测试、
check-copy、py_compile与check-commits通过。没有执行任何真实同步，也没有存取/srv或/var/log。docs/recovery.md的 distfiles 那一节给出可照抄的隔离命令，并明确写出实测数字仍待补，不填估算值。