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>

2 files changed, 4 insertions, 6 deletions

diff --git a/crates/shirabe/tests/dependency_resolver/pool_builder_test.rs b/crates/shirabe/tests/dependency_resolver/pool_builder_test.rs
index a4d118ee..27359fa3 100644
--- a/crates/shirabe/tests/dependency_resolver/pool_builder_test.rs
+++ b/crates/shirabe/tests/dependency_resolver/pool_builder_test.rs
@@ -19,8 +19,7 @@ use shirabe::repository::handle::{LockArrayRepositoryHandle, RepositoryInterface
 use shirabe::repository::lock_array_repository::LockArrayRepository;
 use shirabe::repository::repository_factory::RepositoryFactory;
 use shirabe::repository::repository_set::{RepositorySet, RootAliasInput};
-use shirabe_pcre::preg::Preg;
-use shirabe_php_shim::{PhpMixed, php_regex, preg_split_delim_capture};
+use shirabe_php_shim::{PhpMixed, php_regex, preg_match2, preg_split_delim_capture};
 use std::path::PathBuf;
 
 /// Maps the PHP `$loadPackage` closure: pops the optional `id` from the data, loads the
@@ -138,7 +137,7 @@ fn get_integration_tests(fixtures_dir: &std::path::Path) -> IndexMap<String, Int
     for file in files {
         let file = file.to_str().unwrap().to_string();
 
-        if !Preg::is_match(php_regex!(r"/\.test$/"), &file) {
+        if preg_match2(php_regex!(r"/\.test$/"), &file, 0).is_none() {
             continue;
         }
 
diff --git a/crates/shirabe/tests/dependency_resolver/pool_optimizer_test.rs b/crates/shirabe/tests/dependency_resolver/pool_optimizer_test.rs
index 8c08e1c0..cac8189d 100644
--- a/crates/shirabe/tests/dependency_resolver/pool_optimizer_test.rs
+++ b/crates/shirabe/tests/dependency_resolver/pool_optimizer_test.rs
@@ -11,8 +11,7 @@ use shirabe::package::loader::{ArrayLoader, LoaderInterface};
 use shirabe::package::version::version_parser::VersionParser;
 use shirabe::repository::handle::LockArrayRepositoryHandle;
 use shirabe::repository::lock_array_repository::LockArrayRepository;
-use shirabe_pcre::preg::Preg;
-use shirabe_php_shim::{PhpMixed, php_regex, preg_split_delim_capture};
+use shirabe_php_shim::{PhpMixed, php_regex, preg_match2, preg_split_delim_capture};
 use std::path::PathBuf;
 
 fn load_package(package_data: &PhpMixed) -> BasePackageHandle {
@@ -141,7 +140,7 @@ fn provide_integration_tests() -> IndexMap<
     for file in files {
         let file = file.to_str().unwrap().to_string();
 
-        if !Preg::is_match(php_regex!(r"/\.test$/"), &file) {
+        if preg_match2(php_regex!(r"/\.test$/"), &file, 0).is_none() {
             continue;
         }