refactor(php-shim): remove ArrayObject, inline IndexMap into PhpMixed::Object

ArrayObject was only a thin wrapper around IndexMap<String, PhpMixed>
used as an empty-{} vs empty-[] marker and as the assoc=false JSON
object representation; no reference semantics were involved. Inline its
payload directly into PhpMixed::Object and drop the type along with the
now-dead StdClass.

Side effects of the unification:
- ArrayObject::new was todo!(); the config --global / object-typed get
  paths that built PhpMixed::Object(ArrayObject::new(None)) no longer
  panic.
- base_config_command wrote 'config' as PhpMixed::Array(empty), emitting
  [] instead of {}; now matches PHP's new \ArrayObject ({}).
- The dead is::<StdClass>()/is::<ArrayObject>() instanceof checks in
  JsonManipulator are replaced with the faithful as_object() mapping.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/crates/shirabe-php-shim/src/array.rs b/crates/shirabe-php-shim/src/array.rs
index 4b3e160..8c1988d 100644
--- a/crates/shirabe-php-shim/src/array.rs
+++ b/crates/shirabe-php-shim/src/array.rs
@@ -568,7 +568,7 @@ pub fn count(value: &PhpMixed) -> usize {
     match value {
         PhpMixed::List(items) => items.len(),
         PhpMixed::Array(entries) => entries.len(),
-        PhpMixed::Object(object) => object.count(),
+        PhpMixed::Object(object) => object.len(),
         // PHP 8 throws a `TypeError` for non-countable arguments.
         PhpMixed::Null
         | PhpMixed::Bool(_)