Add Terminalbox remote-control plugin

[dieteradant]

Adds the external copilot-remote-control plugin from Anchras/terminalbox-tools to the official Copilot plugin marketplace and documents it in the External Plugins list.

What it does

The plugin provides a source-visible skill that:

• checks the installed GitHub Copilot CLI before suggesting configuration;
• explains the three official remote-control scopes;
• helps choose a bounded keep-alive policy;
• verifies that the session is reachable from the same GitHub account;
• recommends the official local path whenever the current machine can stay online.

It does not ask for tokens, bypass organization policy, install software, edit Copilot settings, or enable remote access without explicit approval.

Disclosure

I maintain Terminalbox and Anchras/terminalbox-tools. The plugin is MIT-licensed and the setup workflow is free/local-first. It mentions a paid Terminalbox pane only when the user explicitly needs a session to survive laptop sleep or shutdown and has no suitable persistent host. Terminalbox is independent from GitHub, and GitHub Copilot access remains separate.

Verification

• Marketplace JSON parses successfully.
• Plugin names remain unique.
• git diff --check passes.
• The linked plugin is released in terminalbox-tools v0.5.0 and its manifest follows the Agent Plugins 1.0 schema.

[Copilot]

Pull request overview

Adds Terminalbox’s remote-control skill to the official Copilot plugin marketplace.

Changes:

• Registers the external copilot-remote-control plugin.
• Documents its capabilities and optional persistent hosting.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/plugin/marketplace.json	Adds plugin metadata and external source.
README.md	Lists and describes the external plugin.

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[dieteradant]

Addressed in f11a716: the marketplace source is now pinned to immutable ref v0.6.0 and commit e54ac34abe48a1cd18e745d16513048d2a11e3c1, and the README points to the same reviewed release.