Surface observation bundle guidance in PR comments

[chubes4]

Summary

Teach Homeboy Action PR comments to summarize large result sets and point users/agents at uploaded observation bundles for drill-down.

Motivation

PR comments should be navigation surfaces, not giant reports. Once observation bundles are uploaded, comments can show concise status plus exact next commands.

Proposed behavior

• If homeboy-observations is uploaded, mention it in the PR comment or job summary.
• For large result sets, show compact counts and top categories/files.
• Include drill-down guidance:
  • download artifact
  • homeboy runs import <dir>
  • homeboy findings list ...

Acceptance criteria

• PR comments remain concise even with huge findings.
• Comments link command-result artifacts and observation artifacts distinctly.
• Existing homeboy-ci-results behavior remains unchanged.

Related

• Depends on observation export support in Homeboy Action and findings query support in Homeboy core.