Add crash reporting documentation

[benrobson]

Summary

• document crash reporting configuration, runtime handling, and user submission flow
• link the new crash reporting guide from the README documentation section

Testing

• Not run (not requested)

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Codex Task

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/add-crash-reporting-feature-with-webhook

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