test: real-Effect gates for the sink-based escape rules

Positive (must remove writeOne, fail on the current allow-list):
- run_options: runPromise with an onFiberStart that ignores the Fiber.
- retained_fiber: forkChild + Fiber.join, Fiber kept after its scope.

Retention (must keep every method; pass today only through global
bailouts, and miscompile when those are disabled):
- internals_destructuring: `const { mapUnsafe } = context`.
- enumeration: Object.values(context) finds the service Map.
- enumeration_alias: the same through `const values = Object.values`.
- dynamic_name: `context[["map", "Unsafe"].join("")]`.
- json_literal: JSON.stringify({ context }, replacer) reaches the
  service through Context.toJSON, despite the inline literal.

The live Context comes from Effect.withFiber inside the provided scope.

Author: effect-bot

crates/rolldown/tests/rolldown/tree_shaking/effect_service_real/dynamic_name/_config.json

@@ -0,0 +1,8 @@
+{
+  "_comment": "Uses the real effect package from the repository devDependencies.",
+  "config": {
+    "experimental": {
+      "effectServiceShaking": true
+    }
+  }
+}