Port effect-playwright to Effect v4 RC

[fiws]

Changes

• upgrade effect and @effect/vitest to 4.0.0-rc.111
• migrate services, scoped layers, runtime access, Options, fibers, and stream callbacks to Effect v4 APIs
• update Vitest and Playwright integration tests for Effect v4
• remove obsolete Effect v3 platform and CLI dependencies

Verification

• pnpm check
• pnpm type-check
• pnpm build
• pnpm test (101 passed)
• pnpm test:playwright (12 passed, 2 skipped)
• pnpm check-doc-examples (31 examples)
• pnpm coverage

---

Note

High Risk
This is a breaking peer-dependency jump from Effect 3 to Effect 4 RC, rewriting public service tags, streams, Options, and test helpers. Consumers on Effect 3 will not compile or run against this release.

Overview
Breaking: the peer dependency is now effect@^4.0.0-rc.111 (with matching @effect/vitest). @effect/platform is no longer a peer.

Service tags switch from Context.GenericTag / Context.Tag to Context.Service. Event streams use Stream.callback + Queue instead of Stream.asyncPush. Nullable Playwright values use Option.fromNullishOr / liftNullishOr. Page exposeFunction / exposeEffect run via Effect.runPromiseWith on captured context.

Tests move from it.scoped to it.effect, Effect.forkChild, and array-based collect results (no Chunk). The coverage script no longer uses @effect/cli / platform-node. The Playwright test helper builds layers with Layer.buildWithMemoMap and Layer.effect for scoped services.

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commit: e38f642