v4.1.1

A patch release. It fixes the five 4.1.0 bugs in DEBT entry 10 and the test gaps that
let them ship: among them a named-graph delete_node that returned False, fused
search lost on every 4.1.0 upgrade, and a wheel without the Graph.KG sources. It also works around three defects in the Arno callout that 4.1.0
shipped: PageRank, PPR, WCC, CDLP, subgraph and betweenness could return wrong
answers on Arno installs, and BFS raised on graphs over about 500 nodes.
docker compose up starts again.

Install

pip install --upgrade iris-vector-graph==4.1.1

Upgrading from 4.1.0

1. Run initialize_schema(). It now sends the Graph.KG classes from the wheel over
   the connection, so no docker cp is needed.
2. If 4.1.0's upgrade_to_4_0_0 migrated the install, that same call restores
   Graph_KG.kg_RRF_FUSE (fused search failed with SQLCODE -30).
3. With docker compose: docker compose down first. The compose file now pins
   containers.intersystems.com/intersystems/iris-community:2026.1.

Behaviour changes to check:

• delete_node and bulk_delete_nodes take graph=. With none, they reach every
  graph holding the id, as in 4.1.0. A failed delete raises; False means only that
  there was no such node.
• On an Arno install, PageRank, PPR, WCC, CDLP, subgraph and global betweenness now
  come from ObjectScript. Scores can differ from 4.1.0's; 4.1.0's were wrong (see
  KNOWN_ISSUES § Arno callout defects). direction="both"
  betweenness is undirected (LazyKG).
• fhir_graph_sync replies "rebuilt": "repository_behind_watermark" when the
  repository was reset or restored under the graph.
• iris-devtester 1.20 no longer creates the test/test user.

The full list is in CHANGELOG.md.