metadata before a multi-platform reader conditional attaches to only one branch

follow-up to Issue #125

Reader semantics: ^:kw #?(:clj [a] :cljs [b]) applies the metadata to whichever form the conditional yields, i.e. both branches. Your branch currently attaches it only to :clj and silently drops it from :cljs. The expected output below follows the formatter's existing aligned multi-platform style (verified that shape against your build, minus the second ^:kw).

# metadata before a multi-platform reader conditional

> metadata attached to a reader conditional applies to every branch,
> per Clojure reader semantics

--Input
(ns com.example.my-app
  (:require
   ^:kw #?(:clj [aaa.jvm] :cljs [aaa.js])
   [bbb.core]))
--Input

--Expected
(ns com.example.my-app
  (:require
   [bbb.core]
   #?(:clj ^:kw [aaa.jvm]
      :cljs ^:kw [aaa.js])))
--Expected

# metadata before a multi-platform reader conditional

--Input
(ns com.example.my-app
  (:require
   ^:kw #?(:clj [aaa.jvm] :cljs [aaa.js])
   [bbb.core]))
--Input

--Expected
{
  "nsSymbol": "com.example.my-app",
  "requires": [
    {
      "metadata": ["^:kw"],
      "platform": ":clj",
      "symbol": "aaa.jvm"
    },
    {
      "metadata": ["^:kw"],
      "platform": ":cljs",
      "symbol": "aaa.js"
    },
    {
      "symbol": "bbb.core"
    }
  ]
}
--Expected

duplicating the metadata onto every require object in the parse structure is the pragmatic choice — it means sorting and formatting need no special casing — but it does mean parseNs can't distinguish "metadata on the conditional" from "metadata written inside each branch"; the alternative (a metadata key on some conditional-level structure) doesn't exist in the current data model, so duplication seems right.

Start at parseNs and trace how metadata before a multi-platform reader conditional enters the parse structure, then follow the existing aligned multi-platform formatting path. Done means the metadata is represented on both the :clj and :cljs require objects, with the formatter producing the shown expected output.