Fix minimum token permissions for workflows that perform git push

[Copilot]

This PR ensures that GitHub workflow jobs performing git push operations have the required contents: write permission.

Analysis

I audited all GitHub workflows in .github/workflows/ to identify those that perform git push operations:

1. update-dependabot-config.yml - Already has correct contents: write permission ✅
2. split_monorepo.yaml - Missing contents: write permission for the gitsplit job ❌

Changes Made

Added contents: write permission to the gitsplit job in split_monorepo.yaml:

jobs:
  gitsplit:
    runs-on: ubuntu-latest
    permissions:
      contents: write # required for pushing changes
    steps:
      # ... rest of the job

The gitsplit action splits the monorepo and pushes code to multiple target repositories (as configured in .gitsplit.yml), which requires write permissions to perform these git push operations.

Validation

• ✅ All workflow YAML files have valid syntax
• ✅ Only the necessary file was modified
• ✅ Added the required trailing comment "required for pushing changes"

Fixes #25.

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