chore: workspace green check (Task 56)

Three issues uncovered by the full pnpm typecheck/test/boundaries pass
and resolved here:

- core-testing was importing IEventBus / IJobQueue from core-events /
  core-shared, creating two boundary violations (tooling → core) and a
  build-graph cycle. Inlined the type aliases (mirroring how
  RecordingTracer / RecordingLogger handle ITracer / ILogger).
  recording-event-bus.test.ts replaces defineEvent() with an inline
  descriptor literal so no runtime import is needed either. core-events
  and core-shared are removed from core-testing dependencies.

- turbo.json: typecheck and test no longer dependsOn ^typecheck / ^build.
  Each package's tsc / vitest resolves cross-package types via
  node_modules independently, and dropping the topological dep avoids the
  spurious cycle warning that appeared once core-testing started
  importing core-events / core-shared.

- turbo.json: feature.dependencies.allow gains "feature". Cross-feature
  event flow (ADR-015) requires a consumer feature to import the
  publisher's event contract directly. The dangerous form (importing
  the publisher's handler/use-case/repo) is still blocked by E1's
  no-handler-reexport ESLint rule and the missing public exports.

- TaskConfig<"slug-string"> → TaskConfig<{ input; output }> in the gen
  job task template (and the shipped send-welcome-email.task.ts) since
  runtime-generated slugs aren't keys of TypedJobs['tasks'].

turbo/generators/templates/job/task.ts.hbs

@@ -2,9 +2,15 @@
 import type { TaskConfig } from "payload";
 import { {{camelCase feature}}Container } from "../../../di/container";
 import { {{constantCase feature}}_SYMBOLS } from "../../../di/symbols";
-import type { I{{pascalCase job}}Job } from "../../../jobs/{{kebabCase job}}.job";
+import type {
+  I{{pascalCase job}}Job,
+  {{pascalCase job}}Input,
+} from "../../../jobs/{{kebabCase job}}.job";
 
-export const {{camelCase job}}Task: TaskConfig<"{{kebabCase feature}}.{{kebabCase job}}"> = {
+export const {{camelCase job}}Task: TaskConfig<{
+  input: {{pascalCase job}}Input;
+  output: object;
+}> = {
   slug: "{{kebabCase feature}}.{{kebabCase job}}",
   inputSchema: [],
   retries: { attempts: 3, backoff: { type: "exponential", delay: 1000 } },
@@ -12,7 +18,7 @@ export const {{camelCase job}}Task: TaskConfig<"{{kebabCase feature}}.{{kebabCas
     const job = {{camelCase feature}}Container.get<I{{pascalCase job}}Job>(
       {{constantCase feature}}_SYMBOLS.I{{pascalCase job}}Job,
     );
-    await job(input as never);
+    await job(input);
     return { output: {} };
   },
 };