Add awesome-skills plugin: 856+ skill router via antigravity-awesome-skills

9 category-based router skills (architecture, business, data-ai, development,
general, infrastructure, security, testing, workflow) that auto-invoke on
matching keywords and route to the appropriate antigravity skill file.

Includes generate-indexes.py script to regenerate category indexes from
catalog.json when the antigravity repo updates.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

awesome-skills/README.md

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+# Awesome Skills Plugin for Claude Code
+
+Routes to 856+ specialized skills from [antigravity-awesome-skills](https://github.com/sickn33/antigravity-awesome-skills) via 9 category-based router skills.
+
+## Prerequisites
+
+Clone the skills repository:
+```bash
+git clone https://github.com/sickn33/antigravity-awesome-skills.git /home/n8n/plugins/antigravity-awesome-skills
+```
+
+## Skills (Categories)
+
+| Skill | Invocation | Skills Count |
+|-------|-----------|-------------|
+| **Architecture** | `/awesome-skills:architecture` | 64 |
+| **Business** | `/awesome-skills:business` | 38 |
+| **Data & AI** | `/awesome-skills:data-ai` | 159 |
+| **Development** | `/awesome-skills:development` | 127 |
+| **General** | `/awesome-skills:general` | 135 |
+| **Infrastructure** | `/awesome-skills:infrastructure` | 102 |
+| **Security** | `/awesome-skills:security` | 126 |
+| **Testing** | `/awesome-skills:testing` | 24 |
+| **Workflow** | `/awesome-skills:workflow` | 81 |
+
+## Auto-Invocation
+
+Skills are automatically loaded when your query matches category keywords. No manual invocation needed.
+
+## Updating Skills Index
+
+After pulling updates from the antigravity repo:
+```bash
+python3 /home/n8n/plugins/claude-plugins/awesome-skills/scripts/generate-indexes.py
+```
+
+## Installation
+
+```bash
+/plugin marketplace add /home/n8n/plugins/claude-plugins
+/plugin install awesome-skills@ki-brain-plugins
+```