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/self_update/versions.rs b/crates/shirabe/src/self_update/versions.rs
index 4276c646..89028dc5 100644
--- a/crates/shirabe/src/self_update/versions.rs
+++ b/crates/shirabe/src/self_update/versions.rs
@@ -5,9 +5,8 @@ use crate::io::IOInterface;
 use crate::io::IOInterfaceImmutable;
 use crate::util::HttpDownloader;
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
 use shirabe_php_shim::{
-    InvalidArgumentException, PHP_EOL, PhpMixed, UnexpectedValueException, php_regex,
+    InvalidArgumentException, PHP_EOL, PhpMixed, UnexpectedValueException, php_regex, preg_match2,
 };
 
 pub struct Versions {
@@ -90,7 +89,7 @@ impl Versions {
         self.channel = Some(channel.clone());
 
         // rewrite '2' and '1' channels to stable for future self-updates, but LTS ones like '2.2' remain pinned
-        let stored_channel = if Preg::is_match(php_regex!(r"{^\d+$}D"), &channel) {
+        let stored_channel = if preg_match2(php_regex!(r"{^\d+$}D"), &channel, 0).is_some() {
             "stable".to_string()
         } else {
             channel