feat(plugin): serve ProcessExecutor as a proxy stub

Composer reaches this class two ways: the object graph hands one out through
Composer::getLoop()->getProcessExecutor(), and plugins write
`new ProcessExecutor($io)` freely. Both bind to a Rust-side entity, so the
timeout the run shares -- seeded from process-timeout and rewritten while the
run is in flight -- has one value instead of one per world, and the executor
can still be passed to the classes that take one (`new Filesystem($process)`).

Three things the stub generator was missing came with it:

- By-ref parameters. The call carries their positions and the answer carries
  what each holds afterwards; a position the answer omits was never assigned
  to, which is what PHP does with an untouched by-ref parameter.
  ProcessExecutor::execute is the only one on a proxied class.
- Argument arity, reproduced where the real body reads func_num_args().
  execute($cmd) forwards the child's output and execute($cmd, $out) captures
  it, and nothing but the argument count separates the two.
- Static methods that cannot run in the worker. One that reads a static
  property the Rust side owns, or that reaches a guarded class, forwards
  through __shirabeCallStatic instead of being materialized. That also fixes
  Filesystem::isLocalPath and getPlatformPath, whose materialized bodies
  called the guarded Composer\Util\Platform.

The async surface stays an explicit error. executeAsync resolves its promise
with a Symfony Process, whose proc_open() resource and pipes belong to
whichever process called start(), so a Rust-side spawn has none to hand back;
running the real start() in the worker needs a promise representation that
crosses the boundary unresolved.

The fixture project drives the whole synchronous surface from plugin code and
compares the trace against upstream Composer byte for byte.

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

1 files changed, 12 insertions, 20 deletions

diff --git a/crates/shirabe-php-rpc/php/stubs/Composer/Util/Filesystem.php b/crates/shirabe-php-rpc/php/stubs/Composer/Util/Filesystem.php
index e1532889..c66bcf56 100644
--- a/crates/shirabe-php-rpc/php/stubs/Composer/Util/Filesystem.php
+++ b/crates/shirabe-php-rpc/php/stubs/Composer/Util/Filesystem.php
@@ -83,26 +83,6 @@ class Filesystem implements \ShirabeRustStub
         return $path;
     }
 
-    public static function isLocalPath(string $path)
-    {
-        // on windows, \\foo indicates network paths so we exclude those from local paths, however it is unsafe
-        // on linux as file:////foo (which would be a network path \\foo on windows) will resolve to /foo which could be a local path
-        if (Platform::isWindows()) {
-            return Preg::isMatch('{^(file://(?!//)|/(?!/)|/?[a-z]:[\\\\/]|\.\.[\\\\/]|[a-z0-9_.-]+[\\\\/])}i', $path);
-        }
-
-        return Preg::isMatch('{^(file://|/|/?[a-z]:[\\\\/]|\.\.[\\\\/]|[a-z0-9_.-]+[\\\\/])}i', $path);
-    }
-
-    public static function getPlatformPath(string $path)
-    {
-        if (Platform::isWindows()) {
-            $path = Preg::replace('{^(?:file:///([a-z]):?/)}i', 'file://$1:/', $path);
-        }
-
-        return Preg::replace('{^file://}i', '', $path);
-    }
-
     public static function isReadable(string $path)
     {
         if (is_readable($path)) {
@@ -121,6 +101,18 @@ class Filesystem implements \ShirabeRustStub
         return false;
     }
 
+    // Forwarded rather than materialized: it references Composer\Util\Platform, which a guard shadows in the worker.
+    public static function isLocalPath(string $path)
+    {
+        return \ShirabeRpcRuntime::callRust(0, '__shirabeCallStatic', [self::class, 'isLocalPath', [$path]]);
+    }
+
+    // Forwarded rather than materialized: it references Composer\Util\Platform, which a guard shadows in the worker.
+    public static function getPlatformPath(string $path)
+    {
+        return \ShirabeRpcRuntime::callRust(0, '__shirabeCallStatic', [self::class, 'getPlatformPath', [$path]]);
+    }
+
     public function remove(string $file)
     {
         return \ShirabeRpcRuntime::callRust($this->__rhandle, 'remove', [$file]);