deletion screen minimal + 'node' as THE UI word (owner ruling)

Owner 2026-09-30: the confirm dialog's pre-flight impact read had to
go — what full death takes is obvious, the per-open fetch flickered,
and richer facts would only confuse as deletion semantics evolve
(rewiring is on the table). The screen is now: Delete node? / Delete
N nodes?, the names in the mono block, one permanence line, Cancel /
Delete. No loading state, no gone state (a 404 mid-run lands in the
honest failure line), no sessions join — the joins prop died too.

The dead path is deleted end to end: GET /api/graph/nodes/[id],
graphNodeImpact (server), nodeDeletionImpact (core) and their tests.

WORDING: node/node(s) is THE UI word for graph objects, standardized
across every surface's copy (owner, same ruling): the dialog titles,
the chain table's counts/search/summary/delete aria-labels, the
practice dialog's cluster counts, selection line, and empty-cluster
hint. Internal identifiers (selection.propositions) unchanged.

Rewritten dialog pins (tests/delete-node-dialog.test.tsx): minimal
contract — no facts/loading/fetch copy, singular/plural titles, the
cap, 409 dock phrasing, busy states, no 'proposition' left in the
dialog.

tests/graph.test.ts

@@ -591,7 +591,6 @@ import { beginTurn, endTurn } from "../src/server/turn-liveness.ts";
 import { jobStore } from "../src/store/jobs.ts";
 import {
 	deleteNodeTraces,
-	nodeDeletionImpact,
 	type NodeDeletionStats,
 } from "../src/core/graph-deletion.ts";
 import { deleteGraphNode, graphRevision } from "../src/server/graph.ts";
@@ -810,18 +809,6 @@ describe("single-node deletion (deleteNodeTraces + deleteGraphNode, node interlu
 		graphStore.writePositions({ n_dead: { x: 1, y: 1 }, n_keep: { x: 2, y: 2 } });
 	}
 
-	it("nodeDeletionImpact: the confirm dialog's pre-flight facts", () => {
-		buildNodeScenario();
-		assert.deepEqual(nodeDeletionImpact(graphStore, "n_dead"), {
-			edges: 2,
-			// The re-encounter — the only session provenance can name (the
-			// legacy empty-provenance line names none).
-			sessions: ["chat_node_a"],
-		});
-		// Unknown node: null (the route's 404).
-		assert.equal(nodeDeletionImpact(graphStore, "n_missing"), null);
-	});
-
 	it("deleteNodeTraces: FULL DEATH — the node, its edges, its evidence, its anchors, its position", () => {
 		buildNodeScenario();
 		const keepLineBefore = JSON.stringify(graphStore.readNodes().find((n) => n.id === "n_keep"));