refactor: remove placeholder join step

web/apps/console/src/presentation/figures/architecture-catalog.test.ts

@@ -46,7 +46,6 @@ describe("architectureCatalog", () => {
       "NodeUse",
       "Condition",
       "Foreach",
-      "Join",
       "Subgraph",
       "Interrupt",
       "End",

web/apps/console/src/presentation/figures/architecture-catalog.ts

@@ -524,7 +524,6 @@ export const architectureCatalog: FigureCatalogDefinition = defineFigureCatalog(
           "node-use": { x: 0, y: 0 },
           "condition": { x: 300, y: 0 },
           "foreach": { x: 600, y: 0 },
-          "join": { x: 900, y: 0 },
           "subgraph": { x: 150, y: 210 },
           "interrupt": { x: 450, y: 210 },
           "end": { x: 750, y: 210 },
@@ -542,7 +541,6 @@ export const architectureCatalog: FigureCatalogDefinition = defineFigureCatalog(
         },
         { id: "condition", label: "Condition", summary: "Route true or false", kind: "decision", icon: "branch", evidencePointer: "src/wf_core/models/steps.py" },
         { id: "foreach", label: "Foreach", summary: "Create item frames and barrier", kind: "loop", icon: "repeat", evidencePointer: "src/wf_core/models/steps.py" },
-        { id: "join", label: "Join", summary: "Close a branch or frame", kind: "operation", icon: "workflow", evidencePointer: "src/wf_core/models/steps.py" },
         { id: "subgraph", label: "Subgraph", summary: "Enter a prepared child workflow", kind: "boundary", icon: "layers", evidencePointer: "src/wf_core/models/steps.py" },
         { id: "interrupt", label: "Interrupt", summary: "Persist request and wait", kind: "boundary", icon: "pause", evidencePointer: "src/wf_core/models/steps.py", childFigureId: "interrupt-contract-detail" },
         { id: "end", label: "End", summary: "Project a terminal outcome", kind: "terminal", icon: "stop", evidencePointer: "src/wf_core/models/steps.py" },