refactor(xdebug-handler): extract composer/xdebug_handler into the shirabe-xdebug-handler crate

Move `Composer\XdebugHandler` out of shirabe-external-packages and into
its own crate, so the path is `shirabe_xdebug_handler::XdebugHandler`
instead of
`shirabe_external_packages::composer::xdebug_handler::XdebugHandler`.

Standing alone, the stub no longer sits in a crate that shirabe-php-rpc
depends on, so drop the dependency-cycle rationale from the comments that
explain why callers reach for shirabe_php_rpc directly.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 2ed93005..f16de4c4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,6 +25,7 @@ shirabe-symfony-filesystem = { path = "crates/shirabe-symfony-filesystem" }
 shirabe-symfony-finder = { path = "crates/shirabe-symfony-finder" }
 shirabe-symfony-process = { path = "crates/shirabe-symfony-process" }
 shirabe-symfony-string = { path = "crates/shirabe-symfony-string" }
+shirabe-xdebug-handler = { path = "crates/shirabe-xdebug-handler" }
 anyhow = "1.0.102"
 async-trait = "0.1.89"
 base64 = "0.22.1"