fix(api): treat empty-string optional numeric/boolean controls as omit

[seonghobae]

Summary

• Empty/whitespace-string optional numeric and boolean controls are treat-as-omit on chat Completions, Completions, Responses, and embeddings (temperature, top_p, token budgets, penalties, n, seed, logprobs, parallel_tool_calls, include_orchestration_trace, echo, best_of, dimensions, max_output_tokens, Responses stream).
• Whitespace-only stop arrays are omit-equivalent.
• Non-empty invalid string values still fail closed with named errors.
• Tip substrate from fix(api): consolidate OpenAI API honesty and multimodal contracts #565. Local full unit: 917 passed.

Test plan

• pytest tests/test_empty_string_numeric_controls_noop_http_honesty.py
• pytest tests -q (917 passed) — evidence under implementer/evidence/pytest-566-full.log
• CI Full unit + Semgrep product gates

Product gates only: Full unit + Semgrep (Strix ignored). Independent non-author APPROVE still required.

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