[WIP] Configure pnpm-lock.yaml merge driver

[Copilot]

Configure pnpm-lock.yaml Merge Driver

This PR sets up a custom Git merge driver for pnpm-lock.yaml to automatically resolve merge conflicts by running pnpm install.

Completed:

• Create .gitattributes file to specify merge driver for pnpm-lock.yaml
• Create a setup script (scripts/setup-merge-driver.sh) to configure the merge driver
• Update documentation in docs/guide/ide-setup.md with setup instructions
• Test the configuration to ensure it works as expected

Technical Implementation:

• The .gitattributes file tells Git to use the "pnpm-merge" driver for pnpm-lock.yaml
• The setup script configures:
  • merge.pnpm-merge.name = "pnpm-lock.yaml merge driver"
  • merge.pnpm-merge.driver = "pnpm install"
• When merge conflicts occur in pnpm-lock.yaml, Git will automatically run pnpm install to regenerate the lock file
• Documentation provides both automated (via script) and manual setup instructions

Original prompt

pnpm-lock.yaml merge=pnpm-merge
git config merge.pnpm-merge.name "pnpm-lock.yaml merge driver"
git config merge.pnpm-merge.driver "pnpm install"

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