[codex] Harden threads schema parse contract tests

[jwalin-shah]

Summary

• add focused tests around the shared parse::<T>(params) helper in threads schemas
• lock in snake_case top-level request contracts and nested camelCase message contracts
• cover unknown-field and missing-required-field failures explicitly

Problem

The shared thread-schema param parsing path had weak coverage around field naming contracts and serde failure modes, making regressions easier to miss.

Solution

Add targeted tests in src/openhuman/threads/schemas.rs for valid request parsing, deny-unknown-fields behavior, missing required fields, camelCase rejection on outer requests, nested message camelCase enforcement, and optional field handling.

Submission Checklist

• Unit tests — targeted cargo test coverage added
• E2E / integration — N/A; schema parse contract hardening only
• Doc comments — existing file-level docs remain sufficient
• Inline comments — added around the nested camelCase contract

Impact

No runtime behavior change intended. Improves confidence in the thread controller request contract and error surfaces.

Related

• Issue(s): none
• Follow-up PR(s)/TODOs: none

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d5b0be97-a244-4ea0-9f16-f937ef01cf7b

📥 Commits

Reviewing files that changed from the base of the PR and between b3b451f and 6e94ff2.

📒 Files selected for processing (1)

• src/openhuman/threads/schemas.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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