Add gitagent.sh feature (bun install global)

[Copilot]

Adds a new devcontainer feature for gitagent — a framework-agnostic, git-native standard for defining AI agents — installed via bun install -g as requested.

New files

• src/gitagent.sh/install.sh — installs @shreyaskapale/gitagent globally via Bun; auto-installs Bun if absent; supports pinned versions via the VERSION option
• src/gitagent.sh/devcontainer-feature.json — feature metadata, version 1.0.0, single version option (default: latest)
• src/gitagent.sh/NOTES.md — project link and install method docs
• test/gitagent.sh/test.sh — verifies binary presence at /usr/local/bin/gitagent

Updated

• README.md — adds gitagent.sh row alphabetically between getdnote.com and github.com/cli, install method bun

// devcontainer.json usage
"features": {
    "ghcr.io/devcontainer-community/features/gitagent.sh:1": {}
}

Original prompt

Add feature "gitagent.sh" (use bun install global, not npm)

Gh: open-gitagent/gitagent