Add bitness and wow64 properties to UserAgentMetadata

[Copilot]

• Review UserAgentMetadata class and understand current implementation
• Add Bitness property (optional string) to UserAgentMetadata class
• Add Wow64 property (optional boolean) to UserAgentMetadata class
• Verify that the properties are correctly serialized to CDP
• Add test for new properties (ShouldWorkWithBitnessAndWow64)
• Build and verify changes compile successfully
• Code review completed (noted consistency with existing code style)
• Security check completed (no vulnerabilities introduced)
• Updated test attribute to use puppeteer-sharp spec

Summary

Successfully added the missing bitness and wow64 optional properties to the UserAgentMetadata class as requested in the issue.

Changes Made

1. Added Bitness property (string) - Represents the "bitness" of the user agent (e.g., "32" or "64")
2. Added Wow64 property (bool?) - True if on Windows and WOW64 (Windows 32-bit on Windows 64-bit)
3. Added test - Created ShouldWorkWithBitnessAndWow64 test using puppeteer-sharp spec to verify the new properties work correctly
4. Updated .gitignore - Added testKey.pem to ignore list for test server certificates

Implementation Details

• Properties follow existing code patterns in UserAgentMetadata class
• JSON serialization automatically converts to camelCase (Bitness → bitness, Wow64 → wow64)
• Properties with null values are excluded from serialization
• Changes are backward compatible - existing code continues to work

Chrome DevTools Protocol Compliance

These properties match the Chrome DevTools Protocol specification:

• https://chromedevtools.github.io/devtools-protocol/tot/Emulation/#type-UserAgentMetadata

Testing

• New test verifies both properties can be set and retrieved via navigator.userAgentData.getHighEntropyValues()
• Test uses puppeteer-sharp spec designation for PuppeteerSharp-specific tests
• Builds successfully with no errors or warnings
• Backward compatible with existing tests

Resolves the issue requesting bitness and wow64 properties for UserAgentMetadata.

Original prompt

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This section details on the original issue you should resolve

<issue_title>UserAgentMetadata is missing the optional 'bitness' property</issue_title>
<issue_description>Can you please add the 'bitness' property to the UserAgentMetadata class so it can be passed to CDP?
https://chromedevtools.github.io/devtools-protocol/tot/Emulation/#type-UserAgentMetadata

Maybe also add 'wow64' as well for completeness.

Thanks!</issue_description>

Comments on the Issue (you are @copilot in this section)

@kblok Yeah. Makes sense.

Custom agent used: Bidi migration
Implement bidi code

• Fixes UserAgentMetadata is missing the optional 'bitness' property #2884

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[kblok]

@copilot Let's use puppeteer-sharp instead of page.spec.

[Copilot]

Done. Changed to puppeteer-sharp in commit 683eb37.

[Copilot]

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