Add luciq plugin to marketplace catalog

[earthwired]

What this PR does

• Plugin name: luciq
• Type: local (external_plugins)
• Vendored path: ./external_plugins/luciq
• Homepage: https://luciq.ai

Ownership

• I own this plugin or have the right to distribute it.
• Source published under our official org (details below).

First-party submission from Luciq. The plugin is maintained at the official Luciq org repo (github.com/luciqai/agent-skills) and vendored here; the homepage and the vendored manifest's repository field both point to the official luciqai org.

Checklist

• One entry in .grok-plugin/marketplace.json (valid JSON, kebab-case name).
• Local source (no remote SHA needed).
• Regenerated .grok-plugin/plugin-index.json.
• validate-catalog.py passes locally.
• generate-plugin-index.py --check passes locally.
• homepage + description set; includes README.md + .claude-plugin/plugin.json.
• License stated (Apache-2.0).

Security

• No curl | bash, remote-code download/exec, or postinstall RCE.
• No reading/exfiltration of secrets, tokens, .env, or env vars.
• Hooks and MCP scope are least-privilege (no hooks; one MCP server).
• Network endpoints: https://api.luciq.ai/api/mcp — the hosted Luciq MCP server; read access to the user's own Luciq data.
• Credentials/permissions: the user authenticates to their own Luciq account via the MCP server's OAuth flow; no credentials are stored in the plugin.

Notes for reviewers

First-party submission from the Luciq team.