fix(dependency-resolver): query the PHP runtime for the php version

Problem reported the platform php version from the shim's compile-time
PHP_VERSION constant, and the shim's phpversion() hit todo!() for any
extension. Go through the RPC bridge instead, as PHP's
Composer\Platform\Runtime does, and drop the shim function that now has
no callers.

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

1 files changed, 0 insertions, 10 deletions

diff --git a/crates/shirabe-php-shim/src/runtime.rs b/crates/shirabe-php-shim/src/runtime.rs
index 44cae087..ed159abb 100644
--- a/crates/shirabe-php-shim/src/runtime.rs
+++ b/crates/shirabe-php-shim/src/runtime.rs
@@ -185,16 +185,6 @@ pub fn get_loaded_extensions() -> Vec<String> {
     .collect()
 }
 
-pub fn phpversion(_extension: &str) -> Option<String> {
-    if _extension.is_empty() {
-        Some(PHP_VERSION.to_string())
-    } else {
-        // TODO(php-runtime): per-extension version strings are not modeled; PHP returns the extension's
-        // own version, or false when the extension is not loaded.
-        todo!()
-    }
-}
-
 // TODO(php-runtime): the callback should be registered in PHP runtime.
 pub fn set_error_handler(_callback: fn(i64, &str, &str, i64) -> bool) {}