Clojure binding to rift — copy-on-write development workspaces, a faster
alternative to `git worktree` — via the native `librift_ffi` shared library
loaded in-process through the JDK Foreign Function & Memory API
(`java.lang.foreign`, stable since JDK 22).

The native ABI is exactly two C symbols, JSON in / JSON out:

  char* rift_ffi_call(const char* json_request)   ;; heap-allocated reply
  void  rift_ffi_free(char* reply)

A request is `{"command" "create" ...}`; a reply is either
`{"status" "ok" "value" ...}` or
`{"status" "error" "error" {"code" .. "message" .. "path" ..}}`.

Native loading checks, in order:

  1. `RIFT_NATIVE_PATH` / `com.blockether.rift.native.path`,
  2. a bundled `resources/prebuilds/<os>-<arch>/...` classpath resource,
  3. the matching `com.blockether/rift-native-<os>-<arch>` Clojars artifact
     downloaded into `~/.cache/clj-rift`.

Supported platforms: darwin-arm64, darwin-x64, linux-x64, linux-arm64.

REQUIRES the JVM flag `--enable-native-access=ALL-UNNAMED`; without it the
first native call prints a restricted-method warning (and on a future JDK
default of `--illegal-native-access=deny` would fail outright).