feat: add comprehensive skills and agents for Rust development (#1573)

.cursor/agents/_shared/fetch-strategy.md

@@ -0,0 +1,71 @@
+# Web Fetch Strategy
+
+Common web fetching strategy for anti-crawler handling.
+
+## Site Classification
+
+| Type | Examples | Characteristics |
+|------|----------|-----------------|
+| Anti-crawler | Reddit, Twitter/X, LinkedIn | Need login or browser fingerprint |
+| Regular | blog.rust-lang.org, docs.rs | No anti-crawler, direct fetch |
+
+## Fetch Priority
+
+```
+Anti-crawler sites: Local Chrome → crawl4ai MCP → give up and mark
+Regular sites: WebFetch → crawl4ai MCP
+```
+
+## Tools
+
+### 1. Local Chrome (for anti-crawler)
+
+User's real browser with login and normal fingerprint.
+
+**macOS:**
+```bash
+# Open URL
+osascript -e 'tell application "Google Chrome" to open location "URL"'
+
+# Get page HTML
+osascript -e 'tell application "Google Chrome" to execute front window'\''s active tab javascript "document.documentElement.outerHTML"'
+```
+
+### 2. crawl4ai MCP (fallback)
+
+Strong anti-crawler bypass, needs Docker.
+
+```
+mcp__crawl4ai__scrape(url: "URL")
+```
+
+### 3. WebFetch (regular sites)
+
+Built-in tool, simple and fast, no anti-crawler capability.
+
+## Site Routing
+
+| Domain | Tool | Reason |
+|--------|------|--------|
+| reddit.com | Local Chrome | Strict anti-crawler |
+| twitter.com / x.com | Local Chrome | Needs login |
+| linkedin.com | Local Chrome | Strict anti-crawler |
+| *.rust-lang.org | WebFetch | No anti-crawler |
+| docs.rs | WebFetch | No anti-crawler |
+| crates.io | WebFetch | No anti-crawler |
+| this-week-in-rust.org | WebFetch | No anti-crawler |
+| rustfoundation.org | WebFetch | No anti-crawler |
+| github.com | WebFetch | Light rate limit |
+
+## Failure Handling
+
+1. Local Chrome fails → try crawl4ai
+2. crawl4ai fails → try WebFetch
+3. All fail → mark "Fetch failed: {reason}"
+
+## Validation
+
+After fetch, check:
+- Content is not empty
+- Not an error page (403, 429, "blocked")
+- Contains expected data