OpenClaw semantic memory search broken: memory index --force fails with fetch error across all embedding providers

Operators who run OpenClaw at scale report a recurring silent failure mode. The memory layer drops context unpredictably, there is no built in observability to tell you when it happens, and the only way to detect it is when a user complains that the agent forgot something. Third party memory plugins like hmem and MemOS Cloud replace the stack entirely but none solve the detection problem. This runtime middleware hooks into OpenClaw memory reads and writes, fingerprints every stored fact, runs continuous integrity checks against the filesystem, and alerts operators in real time when memory degrades or truncates so they can recover before user trust breaks.