fix(codemode): coerce any value to a property key

[rekram1-node]

const counts = {}
for (const row of rows) counts[row.category] = (counts[row.category] ?? 0) + 1

before   TypeError: Property key must be a string or number, or Symbol.asyncIterator/Symbol.iterator.
         (the moment one row has category: null)
after    { electronics: 12, null: 3 }

ToPropertyKey: a key that is not already a string, number, or one of the two confined symbols becomes its string form, as in JS. o[null] is o["null"], o[true] is o["true"], o[{}] is o["[object Object]"], o[[1, 2]] is o["1,2"]. Applies to reads, writes, compound assignment, object literals, in, and computed destructuring keys — they all go through the one toPropertyKey.

-  private toPropertyKey(value: Value, node: AstNode): PropertyKey {
-    if (typeof value === "string" || typeof value === "number") return value
-    if (value === AsyncIteratorSymbol || value === IteratorSymbol) return value
-    throw typeError("Property key must be a string or number, or …", node)
+  private toPropertyKey(value: Value): PropertyKey {
+    if (typeof value === "string" || typeof value === "number" || typeof value === "symbol") return value
+    return coerceToString(value)
   }

coerceToString is the existing built-in-aware one (Date → ISO string, Promise → [object Promise]); a program object's own toString is not consulted yet — that is the ToPrimitive PR.

Tests

suite	before	after
codemode	5294	5294 (one test rewritten)
test262	3990 / 403	3997 / 396

Seven skipped.txt entries removed (Array/prototype/{every,filter,forEach,map,reduce,reduceRight,some} tests that index with an object key).