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, 24 insertions, 35 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/console/input/input.rs b/crates/shirabe-external-packages/src/symfony/console/input/input.rs
index e14ed354..ceff85f6 100644
--- a/crates/shirabe-external-packages/src/symfony/console/input/input.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/input/input.rs
@@ -80,13 +80,10 @@ impl Input {
         );
 
         if !missing_arguments.is_empty() {
-            return Err(RuntimeException(shirabe_php_shim::RuntimeException {
-                message: format!(
-                    "Not enough arguments (missing: \"{}\").",
-                    shirabe_php_shim::implode(", ", &missing_arguments),
-                ),
-                code: 0,
-            })
+            return Err(RuntimeException::new(format!(
+                "Not enough arguments (missing: \"{}\").",
+                shirabe_php_shim::implode(", ", &missing_arguments),
+            ))
             .into());
         }
 
@@ -113,13 +110,11 @@ impl Input {
             .definition
             .has_argument(&PhpMixed::String(name.to_string()))
         {
-            return Err(
-                InvalidArgumentException(shirabe_php_shim::InvalidArgumentException {
-                    message: format!("The \"{}\" argument does not exist.", name),
-                    code: 0,
-                })
-                .into(),
-            );
+            return Err(InvalidArgumentException::new(format!(
+                "The \"{}\" argument does not exist.",
+                name
+            ))
+            .into());
         }
 
         Ok(match self.arguments.get(name) {
@@ -137,13 +132,11 @@ impl Input {
             .definition
             .has_argument(&PhpMixed::String(name.to_string()))
         {
-            return Err(
-                InvalidArgumentException(shirabe_php_shim::InvalidArgumentException {
-                    message: format!("The \"{}\" argument does not exist.", name),
-                    code: 0,
-                })
-                .into(),
-            );
+            return Err(InvalidArgumentException::new(format!(
+                "The \"{}\" argument does not exist.",
+                name
+            ))
+            .into());
         }
 
         self.arguments.insert(name.to_string(), value);
@@ -174,13 +167,11 @@ impl Input {
         }
 
         if !self.definition.has_option(name) {
-            return Err(
-                InvalidArgumentException(shirabe_php_shim::InvalidArgumentException {
-                    message: format!("The \"{}\" option does not exist.", name),
-                    code: 0,
-                })
-                .into(),
-            );
+            return Err(InvalidArgumentException::new(format!(
+                "The \"{}\" option does not exist.",
+                name
+            ))
+            .into());
         }
 
         Ok(if self.options.contains_key(name) {
@@ -198,13 +189,11 @@ impl Input {
 
             return Ok(());
         } else if !self.definition.has_option(name) {
-            return Err(
-                InvalidArgumentException(shirabe_php_shim::InvalidArgumentException {
-                    message: format!("The \"{}\" option does not exist.", name),
-                    code: 0,
-                })
-                .into(),
-            );
+            return Err(InvalidArgumentException::new(format!(
+                "The \"{}\" option does not exist.",
+                name
+            ))
+            .into());
         }
 
         self.options.insert(name.to_string(), value);