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, 6 insertions, 5 deletions

diff --git a/crates/shirabe/src/repository/array_repository.rs b/crates/shirabe/src/repository/array_repository.rs
index 0f3dc237..2e364d0e 100644
--- a/crates/shirabe/src/repository/array_repository.rs
+++ b/crates/shirabe/src/repository/array_repository.rs
@@ -12,8 +12,7 @@ use crate::repository::{
     RepositoryInterfaceHandle, RepositoryInterfaceWeakHandle, SearchResult,
 };
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{implode, php_regex, preg_quote, preg_split, strtolower};
+use shirabe_php_shim::{implode, php_regex, preg_match2, preg_quote, preg_split, strtolower};
 use shirabe_semver::constraint::AnyConstraint;
 use shirabe_semver::constraint::SimpleConstraint;
 use std::rc::Weak;
@@ -358,7 +357,7 @@ impl RepositoryInterface for ArrayRepository {
 
             let fulltext_match = mode == crate::repository::SEARCH_FULLTEXT
                 && complete.is_some()
-                && Preg::is_match(
+                && preg_match2(
                     &regex,
                     &format!(
                         "{} {}",
@@ -369,9 +368,11 @@ impl RepositoryInterface for ArrayRepository {
                             .get_description()
                             .unwrap_or_default()
                     ),
-                );
+                    0,
+                )
+                .is_some();
 
-            if Preg::is_match(&regex, &name) || fulltext_match {
+            if preg_match2(&regex, &name, 0).is_some() || fulltext_match {
                 if mode == crate::repository::SEARCH_VENDOR {
                     matches.insert(
                         name.clone(),