fix(encode): keep a []any of tables in the value-array form

Assisted-by: GLM 5.3

CHANGELOG.md

@@ -71,6 +71,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   cannot be carried verbatim by the literal form: a run of three single quotes,
   a control character, or a lone carriage return. Such values previously
   produced output that did not re-parse.
+- A `[]any` holding only tables marshals in the value-array form with inline
+  tables, keeping the type `Parse` produces for such an array. It previously
+  took the `[[header]]` form, so a round-trip changed the value's type from
+  `[]any` to `[]map[string]any`.
 - Decoding into a `uint` destination checks the type's platform width instead
   of only the fixed widths, so a 32-bit `uint` no longer truncates silently;
   decoding a finite float beyond the `float32` range is an overflow error