[canary] README command typo

[digitarald]

The README example under Measure says agentrc readines instead of agentrc readiness.

Reproduction:

1. Open README.md.
2. Locate the Measure example.
3. Observe the missing final s.

Expected: the example says agentrc readiness.
Actual: the example says agentrc readines.

This is a synthetic issue created to verify the Issue Triage workflow. Do not implement it.

🤖 Posted by GitHub Copilot on Harald's behalf.