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Adds an optional "harness" field so codex/opencode completions route to their own Usage readers instead of always assuming Claude's transcript format; unblocks the server side named as open in progress.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01W1rkJ2hBMybnJctPbcy4tT