Promote PlaywrightSpawner to the stable package API

[fiws]

Summary

• Move PlaywrightSpawner from src/experimental/ to the stable package root (src/playwright-spawner.ts and src/index.ts).
• Remove PlaywrightSpawner export from effect-playwright/experimental.
• Update service tag to effect-playwright/playwright-spawner/PlaywrightSpawner.
• Update repository test suites, doc examples, README, and guidelines to import PlaywrightSpawner from effect-playwright.

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Note

Medium Risk
Public API break: consumers must import PlaywrightSpawner from effect-playwright instead of /experimental, and the Context tag identity changes. Behavior of scoped browser provisioning is otherwise unchanged.

Overview
Promotes PlaywrightSpawner from effect-playwright/experimental to the stable root (effect-playwright). The module now lives at src/playwright-spawner.ts and is re-exported from src/index.ts.

The experimental barrel no longer exports it. The Context tag is now effect-playwright/playwright-spawner/PlaywrightSpawner. Tests, README, changelog, and agent guidelines import PlaywrightSpawner alongside Playwright from the main package.

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[pkg-pr-new]

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commit: 5b77ba4