Lets users wire the system end-to-end from the graph, and fixes the core
bug that made drag-to-wire silently fail.
- Fix drag-to-wire 422s across 5 entity kinds: updateConnection() now echoes
the target's discriminator (source_type/stream_type/target_type) into the
partial PUT, so value/colour-strip/audio/picture sources and output targets
all wire correctly. New contract test (54 cases) in test_graph_wiring_contract.py.
- Re-wire composite layers / mapped zones from the graph (right-click a
layer/zone source edge -> Re-wire). Whole-list write preserves every sibling
layer/zone setting, with an optimistic-concurrency guard and undo.
- Secret-safe /graph topology: project entities to id/name/subtype + reference
roots so the endpoint cannot leak webhook tokens or other credentials.
- Carry slot indices on list edges; node custom-icon + schema-drift refinements;
rewire i18n keys (en/ru/zh); wiring-control roadmap (TODO.md).
