feat(php-shim): give ported exceptions PHP's class hierarchy

Ported exceptions were flat structs reached with `downcast_ref`, so
Composer's `catch (\RuntimeException $e)` only matched the exact leaf
type and `get_class($e)` had nothing to report. Each exception now
embeds an instance of the class it extends and travels inside an
`AnyThrowable`; `Catch::catch`/`catch_mut` walk that chain, and
`PhpClass::php_class_name` yields the PHP FQCN.

Dropping the `std::error::Error` impls from the exception types leaves
`AnyThrowable` as the only route into an `anyhow::Error`, so the walk
cannot be bypassed. A `no_exception_downcast` linter catches the
`downcast::<X>()` calls that would now silently answer `None`.

Three sites change behavior as a result: the `TransportException`
exit-code override reaches `MaxFileSizeExceededException`, the
`catch (\LogicException)` in findSimilar() reaches its subclasses, and
rendered exception titles carry the real class name rather than a
guess. `get_class_err()` is no longer a `todo!()`, which re-enables
FilesystemRepositoryTest::testCorruptedRepositoryFile.

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

1 files changed, 9 insertions, 14 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/console/command/command.rs b/crates/shirabe-external-packages/src/symfony/console/command/command.rs
index ca61717d..a1636848 100644
--- a/crates/shirabe-external-packages/src/symfony/console/command/command.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/command/command.rs
@@ -138,12 +138,10 @@ impl CommandData {
         let mut matches: Vec<Option<String>> = Vec::new();
         if !shirabe_php_shim::preg_match(php_regex!(r"/^[^\:]++(\:[^\:]++)*$/"), name, &mut matches)
         {
-            return Ok(Err(InvalidArgumentException(
-                shirabe_php_shim::InvalidArgumentException {
-                    message: format!("Command name \"{}\" is invalid.", name),
-                    code: 0,
-                },
-            )));
+            return Ok(Err(InvalidArgumentException::new(format!(
+                "Command name \"{}\" is invalid.",
+                name
+            ))));
         }
 
         Ok(Ok(()))
@@ -847,14 +845,11 @@ impl Command for CommandData {
         let helper_set = match &*helper_set_ref {
             None => {
                 return Ok(Err(
-                    crate::symfony::console::exception::logic_exception::LogicException(
-                        shirabe_php_shim::LogicException {
-                            message: format!(
-                                "Cannot retrieve helper \"{}\" because there is no HelperSet defined. Did you forget to add your command to the application or to set the application on the command using the setApplication() method? You can also set the HelperSet directly using the setHelperSet() method.",
-                                name
-                            ),
-                            code: 0,
-                        },
+                    crate::symfony::console::exception::logic_exception::LogicException::new(
+                        format!(
+                            "Cannot retrieve helper \"{}\" because there is no HelperSet defined. Did you forget to add your command to the application or to set the application on the command using the setApplication() method? You can also set the HelperSet directly using the setHelperSet() method.",
+                            name
+                        ),
                     ),
                 ));
             }