Artifact: Performance Calibration Note — Chris vs Dana

A calibration note comparing two reports' impact against the same ladder rung -- exercises co-07, co-06. Everline and every name here are fictional; every quote is an illustrative, constructed example.

Chris vs Dana -- Senior Engineer rung: "proposes a design approach before coding, and can defend a trade-off in it."

Chris: proposed and defended two design notes this quarter (the retry-queue rework and the alert-batching change), both reviewed and adopted with only minor changes. Meets the rung consistently, not as a one-off.

Dana: proposed one design note this quarter (the schema-versioning approach), which needed a full second pass after review surfaced a missed edge case Dana hadn't considered. Partially meets the rung -- the initiative is there, the defensibility under review is not yet consistent.

Calibration note: Chris is closer to ready for the Senior Engineer conversation on this specific rung than Dana is, based on two independently reviewed design notes versus one that needed rework -- not because Chris is "more senior overall" in some general sense.