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Fix chained exceptions serializing as empty JSON objects (#164)

* Fix chained exceptions serializing as empty JSON objects

The exception chain collector stored raw Throwable objects in the
viewVars. Since Exception properties are protected and the class
does not implement JsonSerializable, json_encode produced {} for
each entry. Extract class, message, code (and file/line in debug
mode) into plain arrays so the chain is visible in JSON responses.

* Use SerializableException wrapper for backwards compatibility

Replace plain array serialization with a SerializableException class
that extends Exception and implements JsonSerializable. This preserves
the Throwable contract for event listeners on beforeRender while
producing structured JSON output. Also caps exception chain traversal
at 10 iterations.

* Fix PHPCS violations

- Avoid count() in loop condition (use depth counter)
- Add doc comments for __construct and jsonSerialize
- Remove space after (int) cast

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