test(repo): guard timeline drag helper boundaries

scripts/check-architecture-guardrails.mjs

@@ -119,6 +119,51 @@ export const rules = [
     ],
     forbidden: [],
   },
+  {
+    file: "apps/web/src/hooks/timelineTouch.ts",
+    maxLines: 80,
+    required: [
+      {
+        pattern: /\bexport function getTouchPoint\b/,
+        message: "timeline touch helpers must keep touch coordinate fallback centralized",
+      },
+      {
+        pattern: /\bexport function resolveTouchDragDecision\b/,
+        message: "timeline touch helpers must keep scroll-vs-drag disambiguation centralized",
+      },
+    ],
+    forbidden: [],
+  },
+  {
+    file: "apps/web/src/hooks/timelineMultiSelect.ts",
+    maxLines: 90,
+    required: [
+      {
+        pattern: /\bexport function createMultiSelectState\b/,
+        message: "timeline multi-select helpers must keep selection bootstrap centralized",
+      },
+      {
+        pattern: /\bexport function finalizeMultiSelectDraft\b/,
+        message: "timeline multi-select helpers must keep minimal-drag reset logic centralized",
+      },
+    ],
+    forbidden: [],
+  },
+  {
+    file: "apps/web/src/hooks/timelineRangeSelection.ts",
+    maxLines: 90,
+    required: [
+      {
+        pattern: /\bexport function updateRangeSelectionDraft\b/,
+        message: "timeline range helpers must keep preview date derivation centralized",
+      },
+      {
+        pattern: /\bexport function finalizeRangeSelection\b/,
+        message: "timeline range helpers must keep ordered range finalization centralized",
+      },
+    ],
+    forbidden: [],
+  },
   {
     file: "apps/web/src/hooks/useTimelineDrag.ts",
     required: [
@@ -126,12 +171,28 @@ export const rules = [
         pattern: /from "\.\/timelineLivePreview\.js"/,
         message: "timeline drag must keep live preview behavior delegated to the extracted helper module",
       },
+      {
+        pattern: /from "\.\/timelineTouch\.js"/,
+        message: "timeline drag must keep touch fallback and drag disambiguation delegated to the extracted helper module",
+      },
+      {
+        pattern: /from "\.\/timelineMultiSelect\.js"/,
+        message: "timeline drag must keep multi-select rectangle lifecycle delegated to the extracted helper module",
+      },
+      {
+        pattern: /from "\.\/timelineRangeSelection\.js"/,
+        message: "timeline drag must keep range preview and finalization delegated to the extracted helper module",
+      },
     ],
     forbidden: [
       {
         pattern: /\bfunction (?:toPxValue|joinTransforms|captureLivePreviewTargets|renderLivePreview|scheduleLivePreview|clearLivePreview|datesMatch|preserveLivePreview)\b/,
         message: "timeline drag must not re-inline live preview helper implementations",
       },
+      {
+        pattern: /\bfunction toClientX\b/,
+        message: "timeline drag must not re-inline touch coordinate fallback helpers",
+      },
     ],
   },
   {