perf(package): hand out link maps behind Rc

PackageInterface::getRequires() and friends return the array of Link objects;
in PHP that is a copy-on-write array of object references, so a caller pays
nothing to look at it. The port returned IndexMap<String, Link> by value, so
every call deep-cloned the whole map, keys and constraints included. Pool
building calls these accessors once per package per candidate, which put
IndexMap::clone at 13.5% of `require laravel/laravel`.

Store the maps as Rc<IndexMap<String, Link>> and return a handle. Callers that
mutate the map clone it explicitly at the point of mutation, matching where PHP
would separate the array.

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

1 files changed, 5 insertions, 5 deletions

diff --git a/crates/shirabe/src/plugin/php_plugin_proxy.rs b/crates/shirabe/src/plugin/php_plugin_proxy.rs
index 4b99f528..0cd36b18 100644
--- a/crates/shirabe/src/plugin/php_plugin_proxy.rs
+++ b/crates/shirabe/src/plugin/php_plugin_proxy.rs
@@ -2005,11 +2005,11 @@ fn dispatch_package_method(
             ))
         }
         "getStability" => Ok(PluginValue::string(package.get_stability().to_string())),
-        "getRequires" => Ok(links(package.get_requires())),
-        "getConflicts" => Ok(links(package.get_conflicts())),
-        "getProvides" => Ok(links(package.get_provides())),
-        "getReplaces" => Ok(links(package.get_replaces())),
-        "getDevRequires" => Ok(links(package.get_dev_requires())),
+        "getRequires" => Ok(links((*package.get_requires()).clone())),
+        "getConflicts" => Ok(links((*package.get_conflicts()).clone())),
+        "getProvides" => Ok(links((*package.get_provides()).clone())),
+        "getReplaces" => Ok(links((*package.get_replaces()).clone())),
+        "getDevRequires" => Ok(links((*package.get_dev_requires()).clone())),
         "getSuggests" => {
             let suggests = package.get_suggests();
             if suggests.is_empty() {