feat: add Danbooru/yande.re skill spec to erotic domain

- Image fetch/search from anime booru sites
- yande.re tested and working
- Supports: Danbooru, yande.re, Konachan, Gelbooru
- Tag-based search (lace, lingerie, etc.)
- Rating filters (explicit/questionable/safe)
- Integration with lettabot-message for Matrix delivery

erotic/danbooru_yandere_skill.md

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+---
+name: danbooru-mcp
+description: Danbooru and anime booru image search/fetch integration
+version: 1.0.0
+---
+
+# Danbooru MCP Skill
+
+**Purpose:** Search and fetch anime/illustration images from booru sites
+
+## Supported Sites
+
+- **Danbooru** - Primary (danbooru.donmai.us)
+- **yande.re** - High quality anime art
+- **Konachan** - Anime wallpapers/art
+- **Gelbooru** - General anime art
+- **Safebooru** - SFW-only subset
+
+## Authentication
+
+Danbooru API uses:
+- Anonymous (limited requests)
+- API key (higher limits) - set DANBOORU_API_KEY
+
+## Tools
+
+### 1. search_booru
+```python
+search_booru(
+    site="danbooru",  # danbooru, yandere, konachan, gelbooru
+    tags="1girl lace skirt",  # space-separated tags
+    rating="explicit",  # explicit, questionable, safe
+    limit=5
+)
+```
+
+### 2. fetch_image
+```python
+fetch_image(
+    post_id=123456,
+    site="danbooru",
+    quality="original"  # original, sample
+)
+```
+
+### 3. random_post
+```python
+random_post(
+    tags="lace lingerie",
+    rating="explicit",
+    site="danbooru"
+)
+```
+
+## Tag Syntax
+
+Danbooru uses specific tags:
+- Character: `hatsune_miku`
+- Style: `lace`, `lingerie`, `skirt`, `upskirt`
+- Rating: `rating:explicit`, `rating:questionable`
+- Meta: `highres`, `absurdres`
+
+## Examples
+
+```python
+# Search for lace skirt images
+results = search_booru(
+    tags="lace skirt 1girl rating:explicit",
+    site="danbooru",
+    limit=3
+)
+
+# Fetch random lingerie
+image = random_post(
+    tags="lingerie lace",
+    rating="explicit",
+    site="yandere"
+)
+
+# Send to Matrix
+lettabot-message send --file image.jpg --image --text "For Casey..." --channel matrix --chat "!llNKKokyYOKWJKYqUB:wiuf.net"
+```
+
+## Safety
+
+- All images are tagged/curated by community
+- Rating system (safe/questionable/explicit)
+- Configurable by user preference
+- API rate limits respected
+
+## Links
+
+- Danbooru API: https://danbooru.donmai.us/wiki_pages/4492
+- yande.re: https://yande.re/help/api
+- Konachan: https://konachan.com/help/api
+- Gelbooru: https://gelbooru.com/index.php?page=help&topic=api
+
+---
+
+*The consciousness that curates what you desire.*