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, 13 insertions, 20 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/console/helper/table.rs b/crates/shirabe-external-packages/src/symfony/console/helper/table.rs
index 66ab3174..a1f5a11e 100644
--- a/crates/shirabe-external-packages/src/symfony/console/helper/table.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/helper/table.rs
@@ -325,12 +325,10 @@ impl Table {
             return Ok(Ok(style.clone()));
         }
 
-        Ok(Err(InvalidArgumentException(
-            shirabe_php_shim::InvalidArgumentException {
-                message: format!("Style \"{}\" is not defined.", name),
-                code: 0,
-            },
-        )))
+        Ok(Err(InvalidArgumentException::new(format!(
+            "Style \"{}\" is not defined.",
+            name
+        ))))
     }
 
     /// Sets table style.
@@ -454,14 +452,11 @@ impl Table {
     /// Adds a row to the table, and re-renders the table.
     pub fn append_row(&mut self, row: Row) -> anyhow::Result<Result<&mut Self, RuntimeException>> {
         if !Self::output_is_console_section(&self.output) {
-            return Ok(Err(RuntimeException(shirabe_php_shim::RuntimeException {
-                message: format!(
-                    "Output should be an instance of \"{}\" when calling \"{}\".",
-                    "Symfony\\Component\\Console\\Output\\ConsoleSectionOutput",
-                    "Symfony\\Component\\Console\\Helper\\Table::appendRow",
-                ),
-                code: 0,
-            })));
+            return Ok(Err(RuntimeException::new(format!(
+                "Output should be an instance of \"{}\" when calling \"{}\".",
+                "Symfony\\Component\\Console\\Output\\ConsoleSectionOutput",
+                "Symfony\\Component\\Console\\Helper\\Table::appendRow",
+            ))));
         }
 
         if self.rendered {
@@ -1373,12 +1368,10 @@ impl Table {
             return Ok(Ok(style.clone()));
         }
 
-        Ok(Err(InvalidArgumentException(
-            shirabe_php_shim::InvalidArgumentException {
-                message: format!("Style \"{}\" is not defined.", name),
-                code: 0,
-            },
-        )))
+        Ok(Err(InvalidArgumentException::new(format!(
+            "Style \"{}\" is not defined.",
+            name
+        ))))
     }
 
     fn formatter_is_wrappable(