chore: remove _adt and _inspector runtime introspection
Input validation is now handled at the HTTP edge using the OpenAPI schema
generated at build time. The worker no longer needs to introspect Python
types at runtime via _inspector/_adt.
Removed:
- python/cog/_adt.py (type ADT for runtime introspection)
- python/cog/_inspector.py (predictor introspection and input validation)
- python/tests/test_adt.py, python/tests/test_inspector.py
Simplified in coglet:
- input.rs: removed Runtime enum, InputProcessor trait, CogInputProcessor,
detect_runtime(), try_cog_runtime(). Replaced with simple prepare_input()
that only handles URLPath downloads.
- worker_bridge.rs: SDK detection uses cog.BasePredictor instead of cog._adt
- predictor.rs: removed runtime/input_processor fields from PythonPredictor
