feat: web SPA bind — add 'combined' (:8392) both-plane option as default
The bind dropdown offered only memory/affect single-plane binds; #18's composite endpoint (:8392, both planes in one session) was never reachable from the SPA. Add 'combined' as the default-selected option, keeping memory-only / affect-only for single-plane isolation diagnostics. - endpoint_for_plane: combined -> :8392 (sessions.py) - web server: accept bifrost_plane="combined" (server.py) - dropdown: combined (:8392) default-selected, single-plane retained (index.html) - #17 contract: endpoint_for_plane FN + plane-selector spec updated to combined - tests: endpoint_for_plane combined, server combined bind -> :8392, dropdown default Suite 506 green. Live-verified on :8765 (current code).
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