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Task 9.4: certifyProvider runs the P9 conformance checklist a provider must pass before backing a channel — declares explicit capabilities, returns providerRef + recognized outcome (never throws), repeatable/idempotent, tolerates empty payload. 2 tests: SandboxProvider passes; a throwing/no-capability provider fails with the specific failing checks listed. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>