feat(phase-c): resolve PHP-array-semantics phase-b TODOs

Resolve category K (array_* functions, integer keys, nested mutation,
sorting). Add shim variants (uasort over Vec<T>, uasort_map for IndexMap)
and delegate to existing typed variants (strtr_array, array_merge_map,
array_search_in_vec). Implement PHP array semantics directly where the
shape is fixed: canonical integer-key coercion (is_php_integer_key,
shared by config and FilesystemRepository::dumpToPhpCode), strict
array_search via trait-object pointer identity, array_reverse/array_chunk
preserve_keys loops, and the installed.php nested version mutations via
auto-vivify helpers.

Resolving the array_merge in UpdateCommand unmasked latent borrow bugs in
execute's tail (Rc input/output moved by value); fixed with .clone() to
match PHP reference sharing, and resolved the tightly-coupled Intervals
constraint check.

composerRequire reclassified to phase-c: it depends on the $GLOBALS
superglobal and PHP's require include mechanism, neither portable.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/crates/shirabe/src/installer/installation_manager.rs b/crates/shirabe/src/installer/installation_manager.rs
index 17d284d..4a13e6b 100644
--- a/crates/shirabe/src/installer/installation_manager.rs
+++ b/crates/shirabe/src/installer/installation_manager.rs
@@ -79,9 +79,11 @@ impl InstallationManager {
     ///
     /// @param InstallerInterface $installer installer instance
     pub fn remove_installer(&mut self, installer: &dyn InstallerInterface) {
-        // TODO(phase-b): array_search for trait object identity needs concrete type info
-        let _ = installer;
-        let key: Option<usize> = None;
+        let target = installer as *const dyn InstallerInterface as *const ();
+        let key = self
+            .installers
+            .iter()
+            .position(|inst| inst.as_ref() as *const dyn InstallerInterface as *const () == target);
         if let Some(k) = key {
             array_splice(&mut self.installers, k as i64, Some(1), vec![]);
             self.cache = IndexMap::new();