Why: buildWorkspaceEntries pushed only BUILTINS[0] (agents); the U4
rdm-audit workspace was declared but never ranked, so no user could
open the trace/audit workspace from the sidebar.
Evidence: vitest workspaces.test.ts 4/4 (updated expectations plus a
new overflow-truncation case); full browser run in scripts/e2e.sh.
Impact: sidebar gains the second builtin tool; server-declared
workspaces keep their shortcut precedence.
Refs: U4 (Dev #368) regression; task feature/rdm-e2e-acceptance.
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