Node schema pivot: short name (label) + full-precision statement; description dropped

With real extracted data, full-sentence statements as canvas labels proved
unworkable: 10-line label blocks, illegible overprint clusters, bottom-edge
clipping. Per the user's 2026-09-08 decision:

- GraphNode/ExtractedProposition gain `name` — a very short, glanceable
  label (glossary-headword style: "Will to power"), presentational only:
  not unique, not identity, never precise. Set at creation; link-appends
  never change it (first line defines; labels stay stable across sessions).
- `statement` keeps its full precision and becomes the identity anchor;
  the detail card shows it under the name. `description` is dropped.
- Extractor coins the name (freshest session context); auditor carries it
  through on create, rewording only clearly unglanceable names; linked
  propositions keep the existing node's name.
- Renderer: canvas label = name; search matches name + statement;
  detail card = name (bold) + statement (muted).
- Store guard requires name (pre-pivot node lines are skipped as legacy);
  vision.md node-schema bullet + amendments table updated (2026-09-08).

tests/graph-context.test.ts

@@ -51,8 +51,8 @@ import { PATHS } from "../config.ts";
 function node(id: string, statement: string, over: Partial<GraphNode> = {}): GraphNode {
 	return {
 		id,
+		name: statement,
 		statement,
-		description: `${statement} — elaborated.`,
 		aliases: [],
 		createdAt: "2026-08-22T00:00:00.000Z",
 		provenance: [],
@@ -346,16 +346,16 @@ describe("cross-chat edge assertions (merger + read-time merging)", () => {
 			propositions: [
 				{
 					id: "p1",
-					statement: "Derivative as a limit",
-					description: "The derivative is the limit of difference quotients.",
+					name: "Derivative as a limit",
+					statement: "The derivative is the limit of difference quotients.",
 					aliases: [],
 					messages: ["u1"],
 					evidence: ["e"],
 				},
 				{
 					id: "p2",
-					statement: "Chain rule intuition",
-					description: "Composed functions differentiate by multiplying local rates.",
+					name: "Chain rule",
+					statement: "Composed functions differentiate by multiplying local rates.",
 					aliases: [],
 					messages: ["u1"],
 					evidence: ["e"],
@@ -377,8 +377,8 @@ describe("cross-chat edge assertions (merger + read-time merging)", () => {
 			propositions: [
 				{
 					id: "q1",
+					name: "Derivative as a limit",
 					statement: "The derivative as a limit of quotients", // different phrasing
-					description: "…",
 					aliases: [],
 					messages: ["u1"],
 					evidence: ["e"],
@@ -386,8 +386,8 @@ describe("cross-chat edge assertions (merger + read-time merging)", () => {
 				},
 				{
 					id: "q2",
+					name: "Chain rule",
 					statement: "Chain rule, intuitively",
-					description: "…",
 					aliases: [],
 					messages: ["u1"],
 					evidence: ["e"],