Update gitconfig 20260127

[toshimaru]

This pull request updates configuration files to improve Git and VSCode setup. The most important changes are grouped below:

Git configuration improvements:

• Added [init] defaultBranch = main to set the default branch name for new repositories, and moved this setting to the appropriate section in .gitconfig. [1] [2]
• Added commented-out options for signing keys and GPG signing in the [user] and [commit] sections, as well as GPG format in the [gpg] section, making it easier to enable these security features in the future. [1] [2]
• Introduced a new tig alias that uses fzf for interactive commit selection and preview, improving Git workflow efficiency.

VSCode extension list updates:

• Removed github.copilot from the vscode_package_names list in variables.yml, likely to avoid redundancy with github.copilot-chat or due to licensing considerations.
• Cleaned up the extension list by removing a commented-out entry for robert.ruby-snippet.

[toshimaru]

The error cause

✘ Cask keybase (6.5.4,20250917154415,52400b6f28)
Error: Download failed on Cask 'keybase' with message: Download failed: https://prerelease.keybase.io/darwin-arm64-updates/Keybase-6.5.4-20250917154415%2B52400b6f28.zip

[Copilot]

Pull request overview

This PR updates dotfile configuration used by the repo’s serverkit.yml.erb provisioning flow, improving default Git initialization behavior and refining VS Code extension installation inputs.

Changes:

• Update .gitconfig to set init.defaultBranch = main and add commented scaffolding for future SSH/GPG signing configuration.
• Add a new git tig alias that uses fzf to select and display commits.
• Clean up variables.yml VS Code extension list (remove github.copilot and a stale commented entry).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
variables.yml	Updates the VS Code extension list used by serverkit.yml.erb to install extensions.
.gitconfig	Sets the default initial branch to main, adds signing-related commented options, and adds an fzf-based alias.

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