test: classify the Insights presence read in the route inventories

The presence read is data, never AI, and spans every module: each flag
whose page a switched-off module hides answers false without reading
the rows. Both inventories now say so.

src/app/api/__tests__/ai-route-inventory.ts

@@ -240,6 +240,8 @@ export const DATA_ROUTES: Readonly<Record<string, string>> = {
     "Lab deltas, owned by the labs module.",
   "src/app/api/insights/health-status/route.ts":
     "Baseline drift, computed over core vitals.",
+  "src/app/api/insights/presence/route.ts":
+    "Which Insights pages have data: counts and flags, no model text.",
   "src/app/api/insights/pulse/intraday/route.ts":
     "The day's pulse shape, a core vital.",
   "src/app/api/insights/patterns/route.ts": "Stored correlation statistics.",

src/app/api/__tests__/module-route-gate-inventory.test.ts

@@ -350,6 +350,9 @@ const EXEMPT_ROUTES: ReadonlyArray<string> = [
   "src/app/api/insights/correlations/route.ts",
   "src/app/api/insights/coach-read/route.ts",
   "src/app/api/insights/health-status/route.ts",
+  // The tab strip's gate spans every module: each flag whose page a
+  // switched-off module hides answers false and its rows are not read.
+  "src/app/api/insights/presence/route.ts",
   "src/app/api/insights/pulse/intraday/route.ts",
   "src/app/api/insights/patterns/route.ts",
   "src/app/api/insights/patterns/[id]/route.ts",