Add mosh.org devcontainer feature

[Copilot]

Adds a new community devcontainer feature for mosh (mobile shell), a UDP-based SSH replacement optimized for roaming and high-latency connections.

Changes

• src/mosh.org/devcontainer-feature.json — Feature definition (name, id, version, docs URL)
• src/mosh.org/install.sh — Installs mosh via apt-get; GitHub releases for mosh are source-only tarballs, making apt the correct distribution mechanism
• test/mosh.org/test.sh — Validates install by asserting mosh --version output contains mosh
• .github/workflows/test.yaml — Adds mosh.org to both test-autogenerated and test-scenarios CI matrices

Usage

"features": {
    "ghcr.io/devcontainer-community/devcontainer-features/mosh.org:1": {}
}

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add feature mosh.org</issue_title>
<issue_description>Files:

src/pi.dev/devcontainer-feature.json
src/pi.dev/install.sh (make sure to set executable bit)
test/pi.dev/test.sh
.github/workflows/test.yaml

Releases:

https://github.com/mobile-shell/mosh/releases</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add feature mosh.org #44

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