V5.0.13/prepare refactoring

[gimlichael]

This pull request refreshes the docs publishing pipeline and clarifies local test guidance. It also expands regression coverage for configured options, automatic discovery, and JSON message handling.

Docs publishing:

• Reliable DocFX container restore with hardened error handling and a lean build context
• Nginx based docs serving with dedicated config, corrected links, and mobile navigation
• Separate member pages and refreshed site rendering for published API docs

Contributor guidance:

• Correct local test invocation syntax for per-project runs
• Clarified integration dependent exclusions from the normal test matrix

Test coverage:

• Consistent configured options behavior across data source and messaging extensions
• Automatic dispatcher, handler, and assembly discovery without duplicates
• JSON converter guards and concrete CloudEvent resolution across both marshallers

[greptile-apps]

Confidence Score: 5/5

[Medium risk] Test coverage expansion and documentation build pipeline updates.

The PR appears safe to merge based on the issues established in this review.

Summary

This PR refreshes the DocFX publishing pipeline and contributor test guidance, and adds regression tests for options registration, discovery, and JSON message handling.

• The changes since the previous review replace the test coverage package and add a hang-dump extension.
• The previous DocFX template thread is resolved; no new actionable finding was established.

_{Reviews (3) · Last reviewed commit: "🔧 swap test coverage to coverlet with h..."}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.70%. Comparing base (a0af51f) to head (6cea8c8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #62      +/-   ##
==========================================
+ Coverage   98.62%   98.70%   +0.08%     
==========================================
  Files         177      177              
  Lines        3783     3643     -140     
  Branches      365      327      -38     
==========================================
- Hits         3731     3596     -135     
+ Misses         50       46       -4     
+ Partials        2        1       -1     

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