v2.2.2 — OpenAI fence-stripping fix

Fixed

• OpenAI provider (#69): strip a wrapping ```json code fence from json_schema responses before parsing. OpenAI-compatible proxies and gateways (e.g. those fronting Gemini/Llama) commonly ignore response_format: json_schema and return fenced JSON, which made the boundary judge's strict JSON.parse throw and silently fall back to the heuristic. Structured output now works through these providers; plain (non-schema) completions are untouched.

Full Changelog: v2.2.1...v2.2.2

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