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Fix broken VCR cassette playback in `langchain-openai` integration tests and add a CI job to prevent regressions. Two independent bugs made all VCR-backed tests fail: `before_record_request` redacts URIs to `**REDACTED**` but `match_on` still included `uri` (so playback never matched), and a typo-fix commit (`c9f51aef85`) changed test input strings without re-recording cassettes (so `json_body` matching also failed).