docs: add agentio-rss skill for Claude Code

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

Author: pal-hexrays

claude/skills/agentio-rss/SKILL.md

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+---
+name: agentio-rss
+description: Use when reading RSS/Atom feeds - list articles, get article content, or get feed info from any blog URL. Auto-discovers feed URLs from blog home pages.
+---
+
+# RSS Feed Operations with agentio
+
+Use `agentio rss` commands to read RSS/Atom feeds. Just provide a blog URL - the feed will be auto-discovered.
+
+## List Articles
+
+```bash
+agentio rss articles <url> [--limit N] [--since YYYY-MM-DD]
+```
+
+Options:
+- `--limit <n>`: Number of articles (default: 20)
+- `--since <date>`: Only articles after this date
+
+Examples:
+```bash
+agentio rss articles https://simonwillison.net --limit 5
+agentio rss articles https://steipete.me --since 2025-01-01
+```
+
+## Get Article Content
+
+```bash
+agentio rss get <url> <article-id>
+```
+
+The article-id can be the article URL or GUID from the articles list.
+
+Example:
+```bash
+agentio rss get https://blog.fsck.com https://blog.fsck.com/2025/12/27/streamlinear/
+```
+
+## Get Feed Info
+
+```bash
+agentio rss info <url>
+```
+
+Shows feed title, description, discovered feed URL, and article count.
+
+Example:
+```bash
+agentio rss info https://kau.sh
+```
+
+## Feed Auto-Discovery
+
+The URL can be:
+- A blog home page (e.g., `https://simonwillison.net`)
+- A direct feed URL (e.g., `https://example.com/feed.xml`)
+
+Auto-discovery checks:
+1. HTML `<link rel="alternate">` tags
+2. Common paths: `/feed`, `/feed.xml`, `/rss.xml`, `/atom.xml`, `/index.xml`