fix: PlaywrightAdapter.evaluateOnPage() spread multiple arguments correctly

[konard]

Summary

Fixes PlaywrightAdapter.evaluateOnPage() to correctly spread multiple arguments to the function in the browser context, matching Puppeteer's behavior.

Root Cause:
Playwright's page.evaluate() only accepts a single argument. When multiple args are passed, the function was receiving the entire array as its first parameter instead of spread arguments.

Solution:
When multiple arguments are passed, the fix:

1. Serializes the function to a string
2. Passes both function string and args array as a single object to page.evaluate()
3. Reconstructs and calls the function with spread arguments in the browser context

Changes

• Fixed PlaywrightAdapter.evaluateOnPage() to spread multiple arguments correctly
• Updated mock to accurately simulate Playwright's single-argument behavior
• Added unit tests for zero, single, and multiple argument scenarios
• Added test for the real-world bug case (selector + array)

Test Plan

• All 365 unit tests pass
• Lint passes (0 errors, pre-existing warnings only)
• CI pipeline passes

Fixes #15

🤖 Generated with Claude Code

[konard]

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