Add offline browser policy and PDF device emulation

[PrzemyslawKlys]

Summary

• add device-scale, mobile-layout, and touch emulation to each isolated browser PDF context without breaking the released constructor contract
• add a fail-closed offline policy that owns Chromium network isolation, blocks DNS and bypass transports, and still supports locally fulfilled HTML documents at an HTTP origin
• preserve URI-credential enforcement and keep header, popup, worker, and subsequent-resource paths inside the same network boundary
• document the public contracts, add contract and live Chromium coverage, and prepare HtmlTinkerX and PSParseHTML 3.0.1

Validation

• full HtmlTinkerX net8.0 suite: 1,240 passed
• affected offline/header contract and live tests: 6 passed on each of net472, net8.0, and net10.0
• canonical PowerForge build completed with signed package payload verification and publishing disabled
• generated HtmlTinkerX 3.0.1 NuGet and PSParseHTML 3.0.1 module artifacts are provenance-bound to commit 0aa2919

[chatgpt-codex-connector]

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Reviewed commit: 165aa40c2f

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[codecov]

Codecov Report

❌ Patch coverage is 96.26866% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.22%. Comparing base (25acf67) to head (0aa2919).

Files with missing lines	Patch %	Lines
...rX/Playwright/HtmlBrowserNetworkPolicyEvaluator.cs	50.00%	0 Missing and 3 partials ⚠️
...tmlTinkerX/Models/HtmlBrowserPdfRendererOptions.cs	97.29%	0 Missing and 1 partial ⚠️
...X/Playwright/HtmlBrowserScopedHeaderInterceptor.cs	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##           v2-speedygonzales     #435      +/-   ##
=====================================================
+ Coverage              54.07%   54.22%   +0.14%     
=====================================================
  Files                    461      462       +1     
  Lines                  34808    34913     +105     
  Branches                6999     7009      +10     
=====================================================
+ Hits                   18824    18930     +106     
+ Misses                 13755    13753       -2     
- Partials                2229     2230       +1     

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 08647c5a31

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".