perf(regex): eliminate per-call clone overhead in preg_* dispatch

regex::Regex::clone() does not share the underlying meta engine's
search-cache pool, so every fresh clone pays a ~10us warmup cost on
its first use. Two changes together eliminate this across nearly all
preg_* call sites:

- A php_regex! macro resolves PHP-style patterns to a per-call-site
  &'static regex::Regex (via regex-macro's LazyLock), applied at the
  majority of call sites throughout the codebase.
- Call sites still passing dynamic pattern strings go through
  PATTERN_CACHE, which now stores Arc<(Regex, bool)> and hands out
  Arc::clone()s instead of cloning the Regex itself.

PregPattern::resolve() returns a ResolvedPattern enum (Arc or
'static reference) rather than an owned Regex, so neither path ever
clones the Regex proper.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/crates/shirabe/src/repository/vcs/forgejo_driver.rs b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
index 0c7e201f..49d0dcf1 100644
--- a/crates/shirabe/src/repository/vcs/forgejo_driver.rs
+++ b/crates/shirabe/src/repository/vcs/forgejo_driver.rs
@@ -17,7 +17,7 @@ use crate::util::http::Response;
 use indexmap::IndexMap;
 use shirabe_external_packages::composer::pcre::{CaptureKey, Preg};
 use shirabe_php_shim::{
-    PhpMixed, RuntimeException, base64_decode, explode, extension_loaded, urlencode,
+    PhpMixed, RuntimeException, base64_decode, explode, extension_loaded, php_regex, urlencode,
 };
 
 #[derive(Debug)]
@@ -585,7 +585,7 @@ impl ForgejoDriver {
         let links = explode(",", &header);
         for link in links {
             let mut m: IndexMap<CaptureKey, String> = IndexMap::new();
-            if Preg::match3(r#"{<(.+?)>; *rel="next"}"#, &link, Some(&mut m))
+            if Preg::match3(php_regex!(r#"{<(.+?)>; *rel="next"}"#), &link, Some(&mut m))
                 && let Some(url) = m.get(&CaptureKey::ByIndex(1))
             {
                 return Some(url.clone());