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A memory file's age note was drifting between requests and blowing the prompt cache
v2.1.275 fixes a restored memory file's age note changing between requests after a compaction or resume, which caused prompt cache misses. A relative timestamp rendered into cached prefix text means the cached block differs by one character on the next request and the whole prefix re-bills. The same release also caches `--system-prompt` text above a `__SYSTEM_PROMPT_DYNAMIC_BOUNDARY__` line globally, matching what the SDK's array form already did.
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