feat(core-analytics): scaffold @repo/core-analytics via generator

Add the `pnpm turbo gen core-package analytics` generator template and
run it to scaffold the @repo/core-analytics workspace package. The
package lands in placeholder state (empty barrel export) ready for the
IAnalytics + NoopAnalytics implementation in the next commit.

Includes:
- turbo/generators/templates/core-package/analytics/ templates
- turbo/generators/config.ts analytics generator registration
- packages/core-analytics/ placeholder scaffold
- apps/web-next/next.config.mjs transpilePackages entry

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

turbo/generators/config.ts

@@ -764,17 +764,35 @@ import noRealtimeHandlerReexport from "./rules/no-realtime-handler-reexport.js";
         },
         printAuditNextSteps,
       ],
+      analytics: () => [
+        () => {
+          assertOptionalPackageNotPresent("core-analytics");
+          return "Guard passed — packages/core-analytics does not exist yet.";
+        },
+        ...emitTemplateTree(
+          "core-package/analytics",
+          "packages/core-analytics",
+        ),
+        () => {
+          addToTranspilePackages(
+            "apps/web-next/next.config.mjs",
+            "@repo/core-analytics",
+          );
+          return "Added @repo/core-analytics to transpilePackages.";
+        },
+        printAnalyticsNextSteps,
+      ],
     };
 
   plop.setGenerator("core-package", {
     description:
-      "Scaffold an optional core package (realtime, events, trpc, ui, audit)",
+      "Scaffold an optional core package (realtime, events, trpc, ui, audit, analytics)",
     prompts: [
       {
         type: "list",
         name: "name",
         message: "Which optional core package?",
-        choices: ["realtime", "events", "trpc", "ui", "audit"],
+        choices: ["analytics", "audit", "events", "realtime", "trpc", "ui"],
       },
     ],
     actions: (answers) => {
@@ -1475,6 +1493,30 @@ function printAuditNextSteps(): string {
   ].join("\n");
 }
 
+function printAnalyticsNextSteps(): string {
+  return [
+    "─────────────────────────────────────────────────────────────",
+    "@repo/core-analytics scaffolded into packages/core-analytics/.",
+    "",
+    "Next steps:",
+    "",
+    "  1. pnpm install   # link the new workspace package",
+    "",
+    "  2. Implement IAnalytics + NoopAnalytics in packages/core-analytics/src/",
+    "     (see story 01-scaffold-core-analytics-package bullet 2)",
+    "",
+    "  3. Add @repo/core-analytics to feature package.json files that need analytics",
+    "",
+    "  4. Wire IAnalytics into apps/web-next/src/server/bind-production.ts:",
+    '     - import { NoopAnalytics, type IAnalytics } from "@repo/core-analytics";',
+    "     - add analytics field to BindAllDeps and BindProductionContext",
+    "     - pass NoopAnalytics (or a vendor adapter) into each feature binder",
+    "",
+    "  5. pnpm typecheck && pnpm lint && pnpm test",
+    "─────────────────────────────────────────────────────────────",
+  ].join("\n");
+}
+
 function coreUiComponentActions(a: {
   tier: "atom" | "molecule" | "organism";
   name: string;