Why: the duties tab only listed existing documents — rdm.docs.instantiate
had no UI entry, so a fresh project showed an empty duties tab with no
setup path (owner trial feedback 2026-10-15).
Evidence: new docs-instantiate-params tests green; full vitest run shows
only the 12 pre-existing conversation-work failures also present at clean
HEAD; design-guard green.
Impact: duties tab gains a template picker + title input wired to
rdm.docs.instantiate (backend command rdm.docs.templates lists published
identities); instantiation refreshes the catalog and selects the new doc.
Refs: Agent-System-RDM docs/records/dhf/u4-header-footer-slots.md
weichen