fix(openai): preserve optional Responses tool inputs

[icecrasher321]

Summary

• Explicitly disable automatic strict normalization for Responses function tools so optional inputs remain optional, matching the declared tool schema.
• Prevent callers from being forced to supply unrelated selectors, such as folder selection during a single-file read. Preserve tool schemas at the shared Responses adapter.

OpenAI documents that Responses attempts strict normalization when strict is omitted: https://developers.openai.com/api/docs/guides/function-calling#strict-mode

Type of Change

• Bug fix

Testing

2,348 provider tests passed, including wrapped and flat tool-schema regressions. Application type check, lint, all 46 repository audits, and block-registry/docs checks passed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

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[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable correctness, security, or repository-rule violations identified.

Summary

This PR updates the shared OpenAI Responses tool adapter to explicitly disable strict normalization, preserving optional fields in declared function-tool schemas.

• Adds strict: false to converted Responses function tools.
• Covers both wrapped and flat input definitions with regression tests.
• Preserves the original parameters schema and required-field list.

_{Reviews (1) · Last reviewed commit: "fix(openai): preserve optional Responses..."}