fix(plugin): make proxy stub property access an explicit error

A proxy stub declares none of the real class's instance properties, and the
`__get`/`__set` forwarders were emitted only for classes that declare a public
one. Every other property access therefore got PHP's own answer for an
undeclared property — null on a read, a dynamic property on a write — so plugin
code reading state the entity holds ran on with null and failed somewhere else
entirely, or not at all.

Emit the forwarders on every root stub, add `__isset`/`__unset` alongside them
so `isset()` cannot answer false silently either, and serve all four from one
dispatcher that answers the state the Rust-side entity exposes and rejects every
other name.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/crates/shirabe-php-rpc/php/stubs/Composer/Installer/InstallationManager.php b/crates/shirabe-php-rpc/php/stubs/Composer/Installer/InstallationManager.php
index 7f41f6b9..6d3e9cf9 100644
--- a/crates/shirabe-php-rpc/php/stubs/Composer/Installer/InstallationManager.php
+++ b/crates/shirabe-php-rpc/php/stubs/Composer/Installer/InstallationManager.php
@@ -58,6 +58,26 @@ class InstallationManager implements \ShirabeRustStub
         \ShirabeRustObjectRegistry::adopt($this->__rhandle, $this);
     }
 
+    public function __get($name)
+    {
+        return \ShirabeRpcRuntime::callRust($this->__rhandle, '__get', [$name]);
+    }
+
+    public function __set($name, $value): void
+    {
+        \ShirabeRpcRuntime::callRust($this->__rhandle, '__set', [$name, $value]);
+    }
+
+    public function __isset($name): bool
+    {
+        return \ShirabeRpcRuntime::callRust($this->__rhandle, '__isset', [$name]);
+    }
+
+    public function __unset($name): void
+    {
+        \ShirabeRpcRuntime::callRust($this->__rhandle, '__unset', [$name]);
+    }
+
     public function __construct(Loop $loop, IOInterface $io, ?EventDispatcher $eventDispatcher = null)
     {
         [$this->__rhandle, $this->__epoch] = \ShirabeRpcRuntime::callRust(0, '__shirabeConstruct', [static::class, [$loop, $io, $eventDispatcher]]);