Fix tool call arguments initialization and validation to use empty object instead of null

[sestinj]

Summary by cubic

Initialize tool call arguments as {} and validate only by name to prevent false “Incomplete tool call” errors and dropped tool calls during streaming.

• Bug Fixes
  • Default tool call arguments to {} in processToolCallDelta for safe incremental merges.
  • Validate tool calls by name only in processStreamingResponse, allowing partial arguments until complete.

[github-actions]

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[cubic-dev-ai]

No issues found across 2 files

[sestinj]

🎉 This PR is included in version 1.28.0 🎉

The release is available on:

• npm package (@latest dist-tag)
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[sestinj]

🎉 This PR is included in version 1.25.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[sestinj]

🎉 This PR is included in version 1.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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