refactor(pcre): inline Preg into its call sites and drop the crate

Preg had shed everything it owned: after the last few rounds its methods
were one-line forwards to the shim's preg_*(), differing only in a
default argument or a wrapper the caller unwrapped anyway. The 460 call
sites now name the shim function, and shirabe-pcre is gone from the
workspace along with its LICENSE entry.

The forwards expand as they read: isMatch becomes
preg_match2(.., 0).is_some() (is_none() where PHP negates it), isMatch3
and match3 drop the .is_some(), matchAll counts through
preg_match_all2(..).occurrence_count(), and replace4/replace5 spell out
the limit and count arguments preg_replace2 takes. Callbacks are the one
place the shapes differ: preg_replace_callback carries an error out of
the callback, so the fourteen infallible closures wrap their result in
Ok() and expect() it back.

Config::process() is the fifteenth, and it drops the `error` cell it
captured to smuggle a failure past a closure that could only return a
String. The `?` in the closure now carries it, which is what the PHP
does -- a throw from the callback leaves preg_replace_callback at the
failing match rather than running the remaining replacements and
reporting the last error.

The module doc that explained why composer/pcre's exceptions and
*StrictGroups() variants have no counterpart moves to the shim's preg
module, where the functions it describes live.

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

1 files changed, 2 insertions, 3 deletions

diff --git a/crates/shirabe/src/installer/library_installer.rs b/crates/shirabe/src/installer/library_installer.rs
index 5f3b2054..d3bf4643 100644
--- a/crates/shirabe/src/installer/library_installer.rs
+++ b/crates/shirabe/src/installer/library_installer.rs
@@ -12,10 +12,9 @@ use crate::repository::InstalledRepositoryInterfaceHandle;
 use crate::util::Filesystem;
 use crate::util::Platform;
 use crate::util::Silencer;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::{
     InvalidArgumentException, LogicException, PhpMixed, dirname, is_dir, is_link, preg_quote,
-    realpath, rmdir, rtrim, strpos,
+    preg_replace, realpath, rmdir, rtrim, strpos,
 };
 
 /// Package installation manager.
@@ -127,7 +126,7 @@ impl LibraryInstaller {
         if let Some(target_dir) = target_dir
             && !target_dir.is_empty()
         {
-            let replaced = Preg::replace(
+            let replaced = preg_replace(
                 format!(
                     "{{/*{}/?$}}",
                     preg_quote(&target_dir, None).replace('/', "/+")