YAML round-trip dropped every edge's handles: export never wrote them
and import hardcoded sourceHandle='bottom'/targetHandle='top-t'. After
import all connections collapsed onto slot 0 ("converge at a single
point"). Per-side handle counts were dropped too, so the extra bottom
slots did not even exist to attach to.
- yaml types: add sourceHandle/targetHandle to connections and
top/bottom/left/rightHandles to nodes
- export: write each edge's real handles + per-side counts (only above
the side default); orient parent-edge handles parent->child
- import: restore handle counts onto node data and use the stored
handles, falling back to the legacy defaults for pre-existing YAML
Positions remain dagre-managed (unchanged); this restores connection
points only.
ha-relevant: yes
Pouzor