New authed workspace page (/topologies, in the global nav) that browses the
topology catalog and builds + visualizes a topology from a kind + roles:
- lib/api/topology.ts: zod schemas + fetchTopologyCatalog (server, authed).
- TopologyGraphView: lightweight SVG renderer (no new deps), laid out per kind
(row for pipeline/ring, star for delegation kinds, circle otherwise).
- TopologyExplorer (client): catalog list + roles input → POST
/api/topologies/build via the /api proxy → render the graph.
- ShellNav: add the Topologies nav item.
- e2e (p8): sign in → nav → browse catalog → build a pipeline → graph renders.
Full suite green (38); npm build + TS clean. Goes live with the next server+
frontend deploy (compare/Pareto UI to follow).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
