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

pnpm-lock.yaml

@@ -585,6 +585,37 @@ importers:
         specifier: ^3.1.0
         version: 3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.7.0)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0)
 
+  packages/core-events:
+    dependencies:
+      "@repo/core-shared":
+        specifier: workspace:*
+        version: link:../core-shared
+      payload:
+        specifier: ^3.0.0
+        version: 3.81.0(graphql@16.13.2)(typescript@5.9.3)
+      zod:
+        specifier: ^3.23.0
+        version: 3.25.76
+    devDependencies:
+      "@repo/core-eslint":
+        specifier: workspace:*
+        version: link:../core-eslint
+      "@repo/core-testing":
+        specifier: workspace:*
+        version: link:../core-testing
+      "@repo/core-typescript":
+        specifier: workspace:*
+        version: link:../core-typescript
+      "@vitest/coverage-v8":
+        specifier: ^3.2.4
+        version: 3.2.4(vitest@3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.7.0)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0))
+      typescript:
+        specifier: ^5.8.0
+        version: 5.9.3
+      vitest:
+        specifier: ^3.0.0
+        version: 3.2.4(@types/debug@4.1.13)(@types/node@25.5.2)(happy-dom@20.8.9)(jiti@2.7.0)(jsdom@25.0.1)(lightningcss@1.32.0)(sass@1.99.0)(terser@5.46.2)(tsx@4.21.0)(yaml@2.9.0)
+
   packages/core-shared:
     dependencies:
       "@opentelemetry/api":