* fix: fail closed legacy tier mutations without etag
Reject non-add tier config mutations when the loaded durable snapshot has no current config ETag. This keeps legacy JSON/no-ETag paths from being saved as creation-style updates before coordinator intent state can bind an old config revision.
Co-Authored-By: heihutu <heihutu@gmail.com>
* fix(tier): allow empty clear without config etag
Allow empty tier clears to initialize the binary config under the namespace coordinator lock while keeping non-empty legacy config mutations fail-closed when no current ETag exists.
Co-Authored-By: heihutu <heihutu@gmail.com>
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Co-authored-by: heihutu <heihutu@gmail.com>
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