chore: add migration notice and disable scheduled workflows

[iwamot]

Summary

• Add migration notice to README pointing users to iwamot/collmbo
• Disable scheduled runs for Renovate and Trivy workflows

🤖 Generated with Claude Code

[github-actions]

Dependency Review

✅ No vulnerabilities found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA b2b12f7.

Ensure that dependencies are being submitted on PR branches and consider enabling retry-on-snapshot-warnings. See the documentation for more information and troubleshooting advice.

Scanned Files

None

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.96%. Comparing base (5420151) to head (b2b12f7).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1069   +/-   ##
=======================================
  Coverage   50.96%   50.96%           
=======================================
  Files          26       26           
  Lines        1244     1244           
  Branches      178      178           
=======================================
  Hits          634      634           
  Misses        606      606           
  Partials        4        4           

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