Hindsight v0.9.0 Makes Agent Memory Storage Pluggable and Adds a Filesystem CLI for Knowledge Pages

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vectorize-io/hindsight (19,370 stars) cut v0.9.0 on August 7. The release adds a pluggable memories storage backend, client-managed knowledge pages with a control-plane UI and a new `hindsight fs` CLI, custom OCR headers in the file parser, and a fix to trigger mental-model refresh on resolved scope rather than the tags column. It also parses GitHub Copilot CLI 1.0.76's native message transcript format and deprecates the standalone hindsight-hermes plugin. The system organizes memory as world facts, experiences, and mental models with retain/recall/reflect operations and four parallel retrieval strategies — semantic, keyword, graph, and temporal — rather than pure vector similarity.