Group related findings and link topic details

[yschimke]

Summary

• link findings to the relevant secondary topic page, including suite-specific anchors where available
• cluster likely-related failures behind a collapsed summary using test class, method, exception, message, and stack-trace similarity
• show score ranges and per-result similarity evidence so grouping remains inspectable
• add focused tests and document the scoring model

Why

Repeated platform and JDK failures currently dominate the findings list and make distinct failures harder to spot. The dashboard also has useful topic pages, but individual findings do not lead readers to that deeper context.

The grouping uses a conservative 65% complete-link threshold, so every member must clear the threshold against every other member rather than joining through a chain of weak matches.

Validation

• node --test site/assets/finding-groups.test.js
• node --check site/assets/status.js
• node --check site/assets/finding-groups.js
• python3 -m unittest discover -s .github/scripts -p 'test_*.py'
• browser validation against the current published latest.json, including ECH and DNS deep links