feat: add cmd/api-drift upstream param-drift probe - #396
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Probes host/model/param matrices against live provider APIs, classifies rejections, corroborates with registry hints (models.dev, OpenRouter), and writes a JSON evidence report; a state file separates new drift from known. Detection only — issue/PR authorship is left to a reviewer.
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Adds a standalone tool that detects upstream parameter-support drift: request params the adapters forward that a model has stopped accepting.
supported/unsupported/rejected_other/inconclusive(auth/429/5xx never count as drift).supported_parameters) recorded as corroborating witnesses; a finding always requires a live rejection.-findingswrites a JSON evidence report (verbatim upstream error, witnesses, repro payload) for review;-stateseparates new drift from known so repeat runs are quiet.First run produced #394 and #395.