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, 3 insertions, 12 deletions

diff --git a/crates/shirabe-external-packages/src/symfony/console/helper/progress_bar.rs b/crates/shirabe-external-packages/src/symfony/console/helper/progress_bar.rs
index 0abee1e7..7bfbfbcd 100644
--- a/crates/shirabe-external-packages/src/symfony/console/helper/progress_bar.rs
+++ b/crates/shirabe-external-packages/src/symfony/console/helper/progress_bar.rs
@@ -642,10 +642,7 @@ impl ProgressBar {
             "remaining".to_string(),
             Box::new(|bar: &ProgressBar, _output: &std::rc::Rc<std::cell::RefCell<dyn OutputInterface>>| {
                 if bar.get_max_steps() == 0 {
-                    return Ok(Err(LogicException(shirabe_php_shim::LogicException {
-                        message: "Unable to display the remaining time if the maximum number of steps is not set.".to_string(),
-                        code: 0,
-                    })));
+                    return Ok(Err(LogicException::new("Unable to display the remaining time if the maximum number of steps is not set.".to_string())));
                 }
 
                 Ok(Ok(shirabe_php_shim::PhpMixed::String(
@@ -658,10 +655,7 @@ impl ProgressBar {
             "estimated".to_string(),
             Box::new(|bar: &ProgressBar, _output: &std::rc::Rc<std::cell::RefCell<dyn OutputInterface>>| {
                 if bar.get_max_steps() == 0 {
-                    return Ok(Err(LogicException(shirabe_php_shim::LogicException {
-                        message: "Unable to display the estimated time if the maximum number of steps is not set.".to_string(),
-                        code: 0,
-                    })));
+                    return Ok(Err(LogicException::new("Unable to display the estimated time if the maximum number of steps is not set.".to_string())));
                 }
 
                 Ok(Ok(shirabe_php_shim::PhpMixed::String(
@@ -814,10 +808,7 @@ impl ProgressBar {
                         let formatter = formatters.as_ref().unwrap().get(&name).unwrap();
                         formatter(self, &self.output)
                     });
-                    match formatter_result? {
-                        Ok(text) => text,
-                        Err(e) => return Err(anyhow::Error::new(e)),
-                    }
+                    formatter_result??
                 } else if let Some(message) = self.messages.get(&name) {
                     shirabe_php_shim::PhpMixed::String(message.clone())
                 } else {