chore: Enable global automerge and config migration in Renovate

[roottool]

Description

Enable global automerge and automatic config migration for Renovate to improve dependency update automation.

Changes:

• Move automerge: true to top-level configuration (applies to all updates)
• Add configMigration: true to enable automatic configuration updates
• Remove redundant automerge from packageRules (no longer needed at rule level)

Boundary Checklist (Required)

• No interpretation

  • Key names are treated as opaque strings
  • No structural inference ([], ., brackets, paths, etc.)

• No silent behavior

  • No merging, overwriting, auto-fixing, or implicit resolution
  • All boundary violations are reported explicitly

• Boundary respected

  • No validation, coercion, schema, framework conventions, or business logic

Type of Change

• Bug fix
• Security fix
• Documentation
• Refactoring (no behavior change)
• Tests
• Tooling / CI

Testing

This change affects Renovate configuration only and does not require application testing. The configuration will be validated by Renovate bot when it runs.

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🤖 Generated with Claude Code

Co-Authored-By: Claude [email protected]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (33e71ac) to head (6a79732).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #24   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           22        22           
  Branches         6         6           
=========================================
  Hits            22        22           

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