python-sdk: fix ruff lint issues in client and verify modules

[GsCommand]

Motivation

• The Python SDK ruff lint run reported import ordering, duplicate key, and E501 long-line violations in client.py, verify.py, and tests, which need to be fixed without changing verifier semantics.

Description

• Removed the duplicate literal "actor" key in build_commons_request while preserving the intended actor override behavior via **body then trailing "actor" assignment in commandlayer/client.py.
• Reformatted multi-argument signatures, wrapped long expressions, and split long lines to satisfy the 100-char E501 limit across commandlayer/client.py, commandlayer/verify.py, and tests/test_client.py without altering logic.
• Reorganized import order and grouped imports to satisfy Ruff in commandlayer/verify.py and commandlayer/__init__.py and added minimal cast usage to keep type-check correctness without changing runtime behavior.
• Made small typing/casting adjustments in client.py and verify.py to address mypy shape expectations while keeping verification logic intact.

Testing

• Ran cd python-sdk && python -m ruff check ., which passed with no issues.
• Ran cd python-sdk && python -m mypy commandlayer, which completed successfully (no issues reported).
• Ran cd python-sdk && python -m pytest, which produced test failures unrelated to the lint-only scope (7 tests failing; see test output), so pytest did not fully pass.
• Ran TypeScript checks and parity tools (cd typescript-sdk && npm run typecheck && npm run build && npm run test:unit and node scripts/parity-check.mjs), which failed due to existing TypeScript compile/build errors and missing build artifact, and were intentionally left unchanged by this lint-only fix.

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Codex Task