fix: preserve non-function Responses tool calls

[orangeboyChen]

Summary

• map Responses mcp_call and custom_tool_call outputs into Chat tool_calls
• preserve custom tool input as valid JSON arguments
• cover non-streaming and streaming conversions with regression tests

Validation

• bun run lint
• bun run format:check
• bun run typecheck
• bun run test:coverage (94% statements, 94.53% lines)
• bun run build blocked by sandbox restriction: Turbopack cannot bind a port

[chatgpt-codex-connector]

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Reviewed commit: e811e5b77c

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.81%. Comparing base (7845b54) to head (8dabf1a).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   94.77%   94.81%   +0.03%     
==========================================
  Files          21       21              
  Lines        4251     4278      +27     
  Branches     1238     1249      +11     
==========================================
+ Hits         4029     4056      +27     
  Misses        222      222              

Flag	Coverage Δ
unittests	94.81% <100.00%> (+0.03%)	⬆️

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[orangeboyChen]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: ecac6f9b30

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".