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2026-08-08feat(php-shim): give ported exceptions PHP's class hierarchynsfisis
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>