Add: agenttrace

[luoyuctl]

Summary

Add agenttrace to the Observability & Evaluation section.

Why this is valuable

• agenttrace inspects local Claude Code sessions, alongside other coding-agent logs.
• It surfaces token usage, cost, tool failures, latency, anomalies, diffs, and CI evidence from local session files.
• The project is public, MIT-licensed, documented, and actively maintained.

Checklist

• The resource is not already in the list
• Link is working
• Description is clear and concise
• Formatting matches the existing style

Validation

• git diff --check
• Verified repository metadata with gh repo view luoyuctl/agenttrace

[luoyuctl]

Refreshed this PR by resetting the commit author to the GitHub noreply identity. Validation: git diff --check upstream/main...HEAD. Current PR state is CLEAN with no checks configured.