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## Why The memories extension has several distinct responsibilities: registering its prompt and tool contributors, enforcing local-memory filesystem boundaries, implementing list/read/search behavior, and wrapping that backend as extension tools. Those responsibilities were concentrated in `lib.rs`, `local.rs`, and the tool modules, which made follow-up work harder to review and risked growing files through unrelated edits. This PR reorganizes the crate so each responsibility has a narrower owner while preserving the same extension entrypoint and memory tool behavior. ## What Changed - Moved extension lifecycle, prompt, and tool registration into `src/extension.rs`, leaving `src/lib.rs` as the small crate entrypoint. - Split `LocalMemoriesBackend` helpers into `local/list.rs`, `local/path.rs`, `local/read.rs`, and `local/search.rs`. - Centralized tool names and limits at the crate level, and kept the backend and extension implementation crate-private. - Made `memory_list`, `memory_read`, and `memory_search` tool executors generic over `MemoriesBackend`, so tests can exercise the full executor path without depending on tool internals. - Consolidated and expanded memory extension tests in `src/tests.rs`, including read/search tool output coverage, multi-query search, windowed `all_within_lines`, and legacy `query` rejection. ## Testing - Not run locally.