feat(core-events): scaffold events optional core

Scaffolded via pnpm turbo gen core-package events (generator-first,
ADR-022 pre-shipped zod trace landed in docs/library-decisions/).
Generator wired transpilePackages + E1/J eslint rule block. Two
story-00-precedent additions so the coverage gates pass: the
@vitest/coverage-v8 devDep (L0 sweep) and the honest symbols.ts
exclude (mirroring core-shared/vitest.config.ts) plus its missing
ALLOWED_GLOBS mirror in scripts/coverage/diff.mjs (L1 gate). No
consumers wired — compile-green floor for the walking-skeleton
PRD (ADR-027).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

apps/web-next/next.config.mjs

@@ -10,9 +10,10 @@ const nextConfig = {
     "@repo/core-cms",
     "@repo/core-consent",
     "@repo/core-dsr",
+    "@repo/core-events",
     "@repo/core-shared",
-    "@repo/core-ui",
     "@repo/core-trpc",
+    "@repo/core-ui",
   ],
 };