refactor: narrow pub(crate) items to private

Porting mapped every PHP `protected` member onto `pub(crate)`, which is
wider than nearly all of them need. Each item demoted here is reached
only from the module that defines it, so the crate-wide visibility
conveyed nothing.

Every `pub(crate)` that survives has at least one reader in another
module of the same crate.

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

1 files changed, 2 insertions, 5 deletions

diff --git a/crates/shirabe/src/downloader/download_manager.rs b/crates/shirabe/src/downloader/download_manager.rs
index c8fb86a7..15b009e6 100644
--- a/crates/shirabe/src/downloader/download_manager.rs
+++ b/crates/shirabe/src/downloader/download_manager.rs
@@ -20,7 +20,7 @@ use shirabe_php_shim::{
 #[derive(Debug)]
 pub struct DownloadManager {
     /// @var IOInterface
-    pub(crate) io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
+    io: std::rc::Rc<std::cell::RefCell<dyn IOInterface>>,
     /// @var bool
     prefer_dist: bool,
     /// @var bool
@@ -425,10 +425,7 @@ impl DownloadManager {
     /// Determines the install preference of a package
     ///
     /// @param PackageInterface $package package instance
-    pub(crate) fn resolve_package_install_preference(
-        &self,
-        package: PackageInterfaceHandle,
-    ) -> String {
+    fn resolve_package_install_preference(&self, package: PackageInterfaceHandle) -> String {
         for (pattern, preference) in &self.package_preferences {
             let pattern_regex = format!(
                 "{{^{}$}}i",