The #7786 squash accidentally committed its worktree copy
(.claude/worktrees/feat-7786/**, since untracked) and leaked probe tests
(repro-8522/probe-9033/repro-8956 — each now green via #9355/#9385/#9354)
plus a stray changelog.d/fixes/9159-fix.plan.md describing an UNMERGED fix
(would fabricate a changelog entry at release time — removed; #9159's own
PR ships its fragment).
This restores the PR's actual deliverable at the right paths: the
management-auth terminology guide (now with the required MDX frontmatter),
its docs test (3/3 green) and its changelog fragment.
