feat(php-rpc): cross materialized values as PHP object records

A materialized value used to cross as a constructor call: the class name,
the arguments, and any post-construction setter. Describing a real
instance that way needed a ReflectionProperty read for every field the
class exposes no getter for, and state no constructor takes (an unset
pretty string, a Link built without a pretty constraint) had no faithful
call to describe it at all.

The value now crosses as the object record serialize() writes for it,
which unserialize() revives without running a constructor, so both sides
transfer the state itself instead of a recipe for rebuilding it. The PHP
half keeps only the class list (also the allowed_classes list of every
frame payload) and the UTC rebasing of dates; describe(), build() and the
reflection are gone.

The wire codec gains O: records (PluginValue::PhpObject) and r: back
references, whose resolution reproduces PHP's numbering of every value in
a payload; a cyclic object graph and a PHP reference (R:) are rejected.

Two behaviours change with it: a date crosses carrying timezone_type 3
"UTC" rather than a +00:00 offset, which is what ArrayLoader builds a
release date as, and a Link subclass crosses as a P-table entity instead
of being silently downgraded to a plain Link.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 13 insertions, 9 deletions

diff --git a/crates/shirabe-php-rpc/php/worker.php b/crates/shirabe-php-rpc/php/worker.php
index 092f535f..15b38770 100644
--- a/crates/shirabe-php-rpc/php/worker.php
+++ b/crates/shirabe-php-rpc/php/worker.php
@@ -227,9 +227,11 @@ final class ShirabeRpcRuntime
             // A natively-constructed dual-mode instance falls through to the P table below.
         }
         if (is_object($value)) {
-            $materialized = \Shirabe\MaterializedValue::describe($value);
+            // A materialized value needs no descriptor: it crosses as the object record
+            // serialize() writes for it, which the Rust side decodes into its own value.
+            $materialized = \Shirabe\MaterializedValue::forWire($value);
             if ($materialized !== null) {
-                return array_map([self::class, 'toWire'], $materialized);
+                return $materialized;
             }
             return ShirabePhpObjectRegistry::descriptor($value);
         }
@@ -242,7 +244,10 @@ final class ShirabeRpcRuntime
         return $value;
     }
 
-    /** Converts a decoded wire value: handle descriptor arrays become live objects. */
+    /**
+     * Converts a decoded wire value: handle descriptor arrays become live objects. A
+     * materialized value arrives as a real instance already, revived by unserialize().
+     */
     public static function fromWire($value)
     {
         if (!is_array($value)) {
@@ -261,9 +266,6 @@ final class ShirabeRpcRuntime
         if (isset($value['__pclass']) && count($value) === 1) {
             return $value['__pclass'];
         }
-        if (isset($value['__pnew'])) {
-            return \Shirabe\MaterializedValue::build(array_map([self::class, 'fromWire'], $value));
-        }
         return array_map([self::class, 'fromWire'], $value);
     }
 
@@ -287,7 +289,7 @@ final class ShirabeRpcRuntime
                 if ($inId !== $corrId) {
                     self::fail("protocol violation: response for unexpected corr_id {$inId}");
                 }
-                $fields = unserialize($payload, ['allowed_classes' => false]);
+                $fields = unserialize($payload, ['allowed_classes' => \Shirabe\MaterializedValue::CLASSES]);
                 if (!is_array($fields)) {
                     self::fail('protocol violation: unparseable response payload');
                 }
@@ -314,7 +316,7 @@ final class ShirabeRpcRuntime
 
     public static function dispatchRequest(int $tag, int $corrId, string $payload): void
     {
-        $fields = unserialize($payload, ['allowed_classes' => false]);
+        $fields = unserialize($payload, ['allowed_classes' => \Shirabe\MaterializedValue::CLASSES]);
         if (!is_array($fields)) {
             self::fail('protocol violation: unparseable frame payload');
         }
@@ -588,7 +590,9 @@ ShirabeRpcRuntime::$dispatch = [
     // Shirabe-internal helpers, not PHP builtins:
     '__shirabe_eval' => static fn($args) => eval($args[0]),
     // Round-trips raw serialize() bytes through the PHP core codec, for the codec oracle tests.
-    '__shirabe_oracle_roundtrip' => static fn($args) => serialize(unserialize($args[0], ['allowed_classes' => false])),
+    '__shirabe_oracle_roundtrip' => static fn($args) => serialize(
+        unserialize($args[0], ['allowed_classes' => \Shirabe\MaterializedValue::CLASSES])
+    ),
     '__shirabe_require' => static function ($args) {
         require_once $args[0];
         // The required file may have registered further prepending autoloaders (a Composer