fix: allows unknown fields in the input schema

[MieszkoWasniowski]

🎯 What does this PR do?

Allows unknown fields in the input schema, like 'tool_reasoning' or 'reasoning', which are injected by some agents. Those extra fields will now be ignored.

✅ Checklist

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation (if needed).
• My commit messages follow the Conventional Commits standard.

[svc-snyk-github-jira]

✅ Snyk checks have passed. No issues have been found so far.

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