Add sanitized markdown exception export for safe AI diagnostics

[ohmyfelix]

Summary

• add a sanitized markdown renderer and dumper that replace exception, stack trace, and request values with type descriptors only
• register an opt-in Tracy extension and BlueScreen panel so the markdown can be inspected or passed to an AI agent without replacing Tracy's normal HTML output
• cover recursive sanitization, HTTP request context, and runtime panel registration with tests and document the new extension

Testing

• vendor/bin/tester tests/Cases
• vendor/bin/phpstan analyse src tests --no-progress

[codecov]

Codecov Report

❌ Patch coverage is 78.36538% with 45 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@78062ef). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/SanitizedMarkdownRenderer.php	74.82%	35 Missing ⚠️
src/SanitizedDumper.php	83.63%	9 Missing ⚠️
src/BlueScreen/SanitizedMarkdownBlueScreen.php	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #34   +/-   ##
=========================================
  Coverage          ?   72.72%           
=========================================
  Files             ?        9           
  Lines             ?      253           
  Branches          ?        0           
=========================================
  Hits              ?      184           
  Misses            ?       69           
  Partials          ?        0           

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