Preserve working log devices when reopen fails - #173
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LogDevice#reopen closes the active Logger-owned file and mutates configuration before the replacement is known to be usable. Open and configure the replacement transactionally, switching state only on success and preserving the working device and settings on failure. Explicitly supplied IO ownership remains unchanged. Current suites pass 64 tests / 323 assertions on Ruby 4.0.6 and 3.2.11; focused reopen failure/success models pass. No repository tests were changed.