Compile soul.el to native El binary for the first time

- Remove duplicate unix_timestamp() definition from soul.el that
  conflicted with the runtime builtin
- Add dist/soul-el: El-compiled native binary (~387K)
- Add dist/soul: symlink to dist/soul-el (replaces neuron-wrk path)
- Add dist/soul.c and dist/soul-with-decls.c: generated C intermediates

soul.el

@@ -506,9 +506,6 @@ fn json_encode(v: Any) -> String {
     return json_stringify(v)
 }
 
-fn unix_timestamp() -> Int {
-    return time_now()
-}
 
 fn proxy_request(base: String, method: String, path: String, body: String, tok: String) -> String {
     let url: String = base + path