feat(plugin): widen the RPC surface to LibraryInstaller-based plugins

An installer that extends LibraryInstaller reaches for the Composer object
graph in ways the proxy did not answer: the download manager and the config,
the writable repository methods, a React promise as its own return value, and
`new Package(...)` from its supports() path.

* `Composer::getConfig`/`getDownloadManager` are dispatched, and both classes
  become generated proxy stubs. Their reads and mutators answer from the Rust
  entity; the surfaces needing stubs of their own (ConfigSourceInterface,
  DownloaderInterface) stay explicit errors.
* The download manager's futures are driven to completion and handed back as
  already-settled React promises, since PHP declares a non-nullable
  PromiseInterface there. A promise a plugin returns is drained the same way:
  settled yields its value, rejected re-raises, pending is an explicit error.
* Proxy stubs now carry the real class's constructor and ask the Rust side to
  allocate the entity; reviving a stub for an existing entity binds the handle
  without running it. Classes Rust cannot build name themselves in the error.
* The package proxy covers `Package`'s own setters, `CompletePackage`'s
  metadata, `RootPackage`'s root-only state, and `BasePackage::$id`.

Link values and release dates still have no wire image, so the methods
carrying them remain explicit errors.

1 files changed, 11 insertions, 19 deletions

diff --git a/crates/shirabe-php-rpc/php/runtime/Composer/EventDispatcher/Event.php b/crates/shirabe-php-rpc/php/runtime/Composer/EventDispatcher/Event.php
index 0d35ac55..e2c63439 100644
--- a/crates/shirabe-php-rpc/php/runtime/Composer/EventDispatcher/Event.php
+++ b/crates/shirabe-php-rpc/php/runtime/Composer/EventDispatcher/Event.php
@@ -4,9 +4,10 @@
 // lives in both worlds at once: an instance revived from a Rust handle proxies every call over
 // RPC (like a generated stub), while an instance constructed natively — real Composer code in
 // this process does `new PreCommandRunEvent(...)`, whose parent constructor lands here — is a
-// faithful in-process port of the real base class. The two modes are told apart by the
-// constructor arguments; `__shirabeRustHandleDescriptor()` returns null in native mode so the
-// wire codec registers the object in the P table instead of treating it as a Rust handle.
+// faithful in-process port of the real base class. Proxy revival binds the handle without
+// running the constructor, so the constructor below is the native mode alone;
+// `__shirabeRustHandleDescriptor()` returns null there so the wire codec registers the object in
+// the P table instead of treating it as a Rust handle.
 
 namespace Composer\EventDispatcher;
 
@@ -29,29 +30,20 @@ class Event implements \ShirabeRustStub
     /** @var bool Whether the event should not be passed to more listeners (native mode) */
     private $propagationStopped = false;
 
-    /**
-     * Proxy revival passes (int $rhandle, int $epoch); the real class's constructor is
-     * (string $name, array $args = [], array $flags = []).
-     */
-    public function __construct($name = null, $args = [], $flags = [])
+    public function __construct(string $name, array $args = [], array $flags = [])
     {
-        if (is_int($name) && func_num_args() === 2 && is_int($args)) {
-            $this->__rhandle = $name;
-            $this->__epoch = $args;
-
-            return;
-        }
-        if (!is_string($name)) {
-            throw new \RuntimeException(
-                'Shirabe does not support constructing ' . static::class . ' inside the plugin process without an event name'
-            );
-        }
         $this->__rhandle = null;
         $this->name = $name;
         $this->args = $args;
         $this->flags = $flags;
     }
 
+    public function __shirabeBind(int $rhandle, int $epoch): void
+    {
+        $this->__rhandle = $rhandle;
+        $this->__epoch = $epoch;
+    }
+
     public function __destruct()
     {
         if ($this->__rhandle !== null) {