docs: Update README, CLAUDE, and AGENTS for NotebookLM skills

- Update skill count from 30 to 34
- Add NotebookLM Tools section (50-59) with 4 skills
- Add NotebookLM agent routing guide in AGENTS.md
- Update directory layout to include 50-53

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -7,7 +7,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 **GitHub**: https://github.com/ourdigital/our-claude-skills
 
 This is a Claude Skills collection repository containing:
-- **custom-skills/**: 30 custom skills for OurDigital workflows, SEO, GTM, Jamie Brand, Reference Curation, and Multi-Agent Collaboration
+- **custom-skills/**: 34 custom skills for OurDigital workflows, SEO, GTM, Jamie Brand, NotebookLM, Reference Curation, and Multi-Agent Collaboration
 - **example-skills/**: Reference examples from Anthropic's official skills repository
 - **official-skills/**: Notion integration skills (3rd party)
 - **reference/**: Skill format requirements documentation
@@ -67,6 +67,17 @@ This is a Claude Skills collection repository containing:
 | 43 | jamie-youtube-manager | YouTube SEO audit & management | "YouTube SEO", "YT optimization" |
 | 44 | jamie-youtube-subtitle-checker | YouTube subtitle validation | "check subtitles", "subtitle QA" |
 
+### NotebookLM Tools (50-59)
+
+| # | Skill | Purpose | Trigger |
+|---|-------|---------|---------|
+| 50 | notebooklm-agent | Q&A from notebooks with citations | "ask NotebookLM", "query notebook", "노트북 질문" |
+| 51 | notebooklm-automation | Notebook/source/artifact management | "create notebook", "add sources", "노트북 관리" |
+| 52 | notebooklm-studio | Content generation (podcasts, videos, quizzes) | "create podcast", "generate video", "make quiz", "팟캐스트 만들기" |
+| 53 | notebooklm-research | Web/Drive research and source discovery | "research topic", "find sources", "리서치" |
+
+**Prerequisites:** `pip install notebooklm-py && playwright install chromium && notebooklm login`
+
 ### Reference Curator & Multi-Agent (90-99)
 
 | # | Skill | Purpose | Trigger |
@@ -199,6 +210,11 @@ our-claude-skills/
 │   ├── 43-jamie-youtube-manager/
 │   ├── 44-jamie-youtube-subtitle-checker/
 │   │
+│   ├── 50-notebooklm-agent/        # Q&A with citations
+│   ├── 51-notebooklm-automation/   # Notebook management
+│   ├── 52-notebooklm-studio/       # Content generation
+│   ├── 53-notebooklm-research/     # Research workflows
+│   │
 │   ├── 90-reference-curator/       # Modular reference documentation suite
 │   │   ├── commands/               # Claude Code slash commands
 │   │   ├── 01-reference-discovery/