feat: minify VS Code extensions

[lsorber]

Changes:

• Harmonize the root devcontainers.json with the template devcontainers.json
• Add ty to the root dependencies
• Subsume the GitHub.copilot extension by setting "chat.extensionUnification.enabled": true
• Remove the visualstudioexptteam.vscodeintellicode extension, as it's deprecated
• Remove the ryanluker.vscode-coverage-gutters extension, as this feature is now built in to VS Code
• Remove deprecated VS Code settings
• Enable bracket pair coloring

[Copilot]

Pull request overview

This PR modernizes the VS Code development environment by removing deprecated and redundant extensions, updating dependencies, and harmonizing configuration between the root and template devcontainer.json files.

• Removes deprecated VS Code extensions (IntelliCode, Coverage Gutters) and subsumes GitHub Copilot into Copilot Chat
• Adds the ty linter to dependencies (version 0.0.6) and extensions
• Cleans up deprecated VS Code settings and adds explicit code formatting settings

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
uv.lock	Updates lockfile with new ty dependency and refreshed package metadata including upload timestamps
template/pyproject.toml.jinja	Bumps ty version requirement from 0.0.5 to 0.0.6
template/.devcontainer/devcontainer.json.jinja	Removes deprecated extensions and settings, adds extensionUnification and explicit formatting configuration
pyproject.toml	Adds ty>=0.0.6 to root dependencies
.devcontainer/devcontainer.json	Harmonizes root devcontainer with template changes

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