Fix CI type-check failures and lint errors

[qCanoe]

Motivation

• CI was failing with mypy errors about Any return values from RPC helpers and several lint/import issues reported by ruff.
• The extractor had type/variable mixups between asset and permission changes which caused type-check failures and unused-variable lints.

Description

• Validate RPC client return payloads in Simulator before returning to satisfy mypy (check for None and dict in get_transaction, get_transaction_receipt, and _get_trace).
• Separate asset vs permission variables in DeltaExtractor event loop and rename to permission_change where appropriate to avoid type confusion.
• Move contract_addr and data extraction into each parser and add explicit changes: List[AssetChange] typing for ERC1155 batch handling.
• Run ruff --fix and apply small manual cleanups to remove unused imports and redefinitions across modules and tests (including removing unused ETH_ADDRESS import in tests/test_types.py).

Testing

• Ran static type checks with mypy src/ --ignore-missing-imports and it completed with no issues.
• Ran linter checks with ruff check . and all checks passed.
• Ran the test suite with pytest -q and all tests passed (57 passed).

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Codex Task