docs: Super Search v2.1 — circuit breaker, racing search, screenshots

docs/super-search-cf-bypass.md

@@ -35,3 +35,30 @@ r = asyncio.run(_extract_one('https://nowsecure.nl'))
 print(r['provider'])  # Should be 'trafilatura' or 'browserless'
 "
 ```
+
+---
+
+## v2.1 Features (Added July 21, 2026)
+
+### 13 Tools
+| # | Tool | Description |
+|---|---|---|
+| 1-10 | Original 10 | Search, extract, lookup, suggest, images |
+| 11 | `web_search_fast` | Parallel racing: all providers fire simultaneously |
+| 12 | `screenshot` | Browserless Chrome → base64 PNG |
+| 13 | `circuit_status` | Provider health states (closed/open/half-open) |
+
+### Circuit Breaker
+- 8 provider circuits: 3 failures → open for 60s
+- Prevents hammering dead providers
+- Auto-recovers when provider comes back
+
+### Parallel Racing
+- `web_search_fast`: SearXNG ∥ Exa ∥ DuckDuckGo ∥ Wikipedia
+- First successful result wins — others cancelled
+- Typically 2-3x faster than sequential fallback
+
+### Screenshot
+- Browserless Chrome on port 3006 (Caddy HTTP proxy)
+- Full-page or viewport capture
+- Base64-encoded PNG in JSON response