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feat: derive in-memory layer from another FileSystem - #5
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Adds \layerFromPath\ and \makeVolFromFileSystem\ which walk a source directory through any caller-provided Effect-TS FileSystem (Node, Bun, custom) and replicate the tree into a fresh memfs Volume. Files, empty directories, symlinks, mode bits, owner, and access/modification times are all preserved. Source can be remapped via \mountAt\. \ eadDirectory\ is reshaped to mirror \ ode:fs/promises.readdir\ semantics exactly: relative paths with forward-slash separators, with intermediate directories included under recursive mode. Also adds a \playground/\ workspace, renames the cross-validation suite to the \.test.ts\ convention, and wires it up to vitest. TODO(1:1-parity): every operation in this module must remain behaviorally identical to NodeFileSystem. Enforced by the cross- validation suite in test/file-system-suite.test.ts. Documented in README under Roadmap and pinned via a marker comment in src/index.ts.
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