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, 4 insertions, 3 deletions

diff --git a/crates/shirabe/src/downloader/fossil_downloader.rs b/crates/shirabe/src/downloader/fossil_downloader.rs
index cdc5f268..e7b3a20d 100644
--- a/crates/shirabe/src/downloader/fossil_downloader.rs
+++ b/crates/shirabe/src/downloader/fossil_downloader.rs
@@ -12,8 +12,9 @@ use crate::package::PackageInterfaceHandle;
 use crate::util::Filesystem;
 use crate::util::ProcessExecutor;
 use indexmap::IndexMap;
-use shirabe_pcre::Preg;
-use shirabe_php_shim::{PhpMixed, RuntimeException, impl_php_class, php_regex, preg_split};
+use shirabe_php_shim::{
+    PhpMixed, RuntimeException, impl_php_class, php_regex, preg_match2, preg_split,
+};
 
 #[derive(Debug)]
 pub struct FossilDownloader {
@@ -227,7 +228,7 @@ impl VcsDownloader for FossilDownloader {
         };
 
         for line in lines {
-            if Preg::is_match(&match_pattern, &line) {
+            if preg_match2(&match_pattern, &line, 0).is_some() {
                 break;
             }
             log.push_str(&line);