docs: point Cursor install at the live marketplace listing (#100)

Cursor now lists the plugin in its marketplace, so the install table drops "(pending)" and deep-links to the listing. Also corrects the CLI install command: the interactive install path is `/plugins` (per the Cursor CLI's own tip, "use /plugins in interactive mode to install plugins from this marketplace"), not `/plugin` (which is the marketplace-management namespace). The editor `/add-plugin` command is unchanged.

Author: mraible

README.md

@@ -23,7 +23,7 @@ AI coding assistant skills for building [CrowdStrike Falcon Foundry](https://www
 | Claude Code | `/plugin install crowdstrike-falcon-foundry` | [Anthropic](https://claude.com/plugins/crowdstrike-falcon-foundry) |
 | Codex | `codex plugin add crowdstrike-falcon-foundry` | [OpenAI](https://chatgpt.com/plugins) (pending) |
 | Copilot CLI | `copilot plugin install CrowdStrike/foundry-skills` | [GitHub](https://github.com/marketplace?type=copilot-plugins) |
-| Cursor | `/add-plugin crowdstrike-falcon-foundry` | [Cursor](https://cursor.com/marketplace) (pending) |
+| Cursor | `/plugins` (CLI) or `/add-plugin crowdstrike-falcon-foundry` (IDE) | [Cursor](https://cursor.com/marketplace/crowdstrike/crowdstrike-falcon-foundry) |
 | Antigravity CLI | `agy plugin install https://github.com/CrowdStrike/foundry-skills` | [Google](https://antigravity.google/docs/plugins) |
 
 All five assistants have been verified end to end: the skills were loaded from a local clone, then used to build and deploy an app to a live Falcon Foundry tenant from the example prompt below.