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Problem: Several subsystems need to derive a short, filesystem-safe identifier from an arbitrary path, and each reinvents it ad-hoc: - `'undodir'` and `swapfiles` encode the full path into a single filename, which may exceed filesystem length-limits. - `:connect ssh://` needs the SSH ControlPath socket name to stay under the 104-byte `sun_path` limit on macOS; today the path overflows it. - the upcoming :terminal state dir. - arbitrary plugin purposes. Solution: Provide `vim.fs.slug()`, which generates a bounded, one-way filename from an arbitrary string. The input is normalized so equivalent paths produce the same result. An 8-char hash is appended for uniqueness