fix: improve typings and remove mypy ignores

[timl3136]

What changed?
Improve typings and remove mypy ignores, also add clear mypy cache to make clean command

Why?
we should not use ignore to override type safety check.

How did you test it?
only typing improvements

Potential risks

Release notes

Documentation Changes

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Summary by Gitar

• Typing improvements:
  • Explicitly cast call_details.method to bytes in retry.py to handle runtime type changes in grpcio v1.75.0+.
  • Added cast in test suites to resolve type mismatches in GetWorkflowExecutionHistory responses and StartWorkflowOptions dictionary mocking.

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[gitar-bot]

Code Review ✅ Approved 1 resolved / 1 findings

Refactored typings and removed redundant mypy ignores throughout the codebase. The comparison logic in is_retryable was corrected to handle decoded strings instead of bytes constants.

✅ 1 resolved

✅ Bug: is_retryable compares decoded str to bytes constant

📄 cadence/_internal/rpc/retry.py:47 📄 cadence/_internal/rpc/retry.py:105-109
At line 109 in retry.py, method has been decoded from bytes to str (line 106-107), but GET_WORKFLOW_HISTORY is defined as b"..." (bytes) on line 47. The comparison method == GET_WORKFLOW_HISTORY will always be False, breaking the retry-on-passive-side logic for GetWorkflowExecutionHistory. This means EntityNotExistsError from cross-cluster requests will no longer be retried.

If method is already a str (not bytes), the decode branch is skipped but the comparison still fails because the constant is bytes.

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