chore(py): track arg_defaults_sync removal (no sdk diff)

[chyroc]

Summary

• Track sync for coze-sdk-gen removal of arg_defaults_sync mapping support.
• Regeneration comparison on latest coze-py main shows no .py source diff attributable to this config-removal change.
• Keep downstream PR traceability for paired workflow.

Upstream

• coze-sdk-gen PR: refactor(codegen): remove arg_defaults_sync config support coze-sdk-gen#52

Validation

• ./scripts/genpy.sh --output-sdk /tmp/coze-py-qEF1lO --ci-check (executed in codegen workflow)
• Main-vs-branch generation isolation check: no .py source diff

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.75%. Comparing base (b912b34) to head (563f144).
⚠️ Report is 2 commits behind head on main.

@@           Coverage Diff           @@
##             main     #416   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files         105      105           
  Lines        9542     9542           
=======================================
  Hits         8755     8755           
  Misses        787      787           

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[chyroc]

Closing per request: upstream track is cancelled and this downstream no-diff sync is no longer needed.