src/exceptions.py was a byte-for-byte duplicate of the canonical
core/exceptions.py. Replace its class bodies with a re-export shim
(mirroring the core/constants.py -> src/constants.py pattern) so the
exception classes are defined in exactly one place. Also fix the stale
"# src/exceptions.py" header comment in core/exceptions.py.
No behavior change: both import paths resolve to the same class objects
(verified by identity), so `except SessionNotFoundError` works regardless
of which module it was imported from. Ran py_compile and
pytest tests/test_app.py (12 passed).
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Solanki Sumit