feat(agents): rename to sentiment_analyst; integrate StockTwits + Reddit

Pre-fetches news + StockTwits + Reddit via no-auth public endpoints
and injects structured data blocks into the prompt with professional
analysis instructions. Replaces the prompt-vs-tool mismatch that
caused fabricated social-platform content. Backward-compat alias +
"social" CLI key preserved.

#557 #607

tradingagents/dataflows/stocktwits.py

@@ -0,0 +1,83 @@
+"""StockTwits public symbol-stream fetcher.
+
+StockTwits exposes a per-symbol message stream at
+``api.stocktwits.com/api/2/streams/symbol/{ticker}.json`` that requires no
+API key, no OAuth, and no registration. Each message includes a
+user-labeled sentiment field (``Bullish``/``Bearish``/null), the message
+body, timestamp, and posting user.
+
+The function is deliberately self-contained: short timeout, graceful
+degradation on any HTTP or parse failure, and a string return type so
+the calling agent gets a uniform interface regardless of whether the
+network call succeeded.
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+from datetime import datetime, timezone
+from typing import Optional
+from urllib.error import HTTPError, URLError
+from urllib.request import Request, urlopen
+
+logger = logging.getLogger(__name__)
+
+_API = "https://api.stocktwits.com/api/2/streams/symbol/{ticker}.json"
+_UA = "tradingagents/0.2 (+https://github.com/TauricResearch/TradingAgents)"
+
+
+def fetch_stocktwits_messages(ticker: str, limit: int = 30, timeout: float = 10.0) -> str:
+    """Fetch recent StockTwits messages for ``ticker`` and return them as a
+    formatted plaintext block ready for prompt injection.
+
+    Returns a placeholder string when the endpoint is unreachable, the
+    symbol has no messages, or the response shape is unexpected — the
+    caller never has to special-case None or exceptions.
+    """
+    url = _API.format(ticker=ticker.upper())
+    req = Request(url, headers={"User-Agent": _UA, "Accept": "application/json"})
+    try:
+        with urlopen(req, timeout=timeout) as resp:
+            data = json.loads(resp.read())
+    except (HTTPError, URLError, json.JSONDecodeError, TimeoutError) as exc:
+        logger.warning("StockTwits fetch failed for %s: %s", ticker, exc)
+        return f"<stocktwits unavailable: {type(exc).__name__}>"
+
+    messages = data.get("messages", []) if isinstance(data, dict) else []
+    if not messages:
+        return f"<no StockTwits messages found for ${ticker.upper()}>"
+
+    lines = []
+    bullish = bearish = unlabeled = 0
+    for m in messages[:limit]:
+        created = m.get("created_at", "")
+        user = (m.get("user") or {}).get("username", "?")
+        entities = m.get("entities") or {}
+        sentiment_obj = entities.get("sentiment") or {}
+        sentiment = sentiment_obj.get("basic") if isinstance(sentiment_obj, dict) else None
+        body = (m.get("body") or "").replace("\n", " ").strip()
+        if len(body) > 280:
+            body = body[:280] + "…"
+
+        if sentiment == "Bullish":
+            bullish += 1
+            tag = "Bullish"
+        elif sentiment == "Bearish":
+            bearish += 1
+            tag = "Bearish"
+        else:
+            unlabeled += 1
+            tag = "no-label"
+        lines.append(f"[{created} · @{user} · {tag}] {body}")
+
+    total = bullish + bearish + unlabeled
+    bull_pct = round(100 * bullish / total) if total else 0
+    bear_pct = round(100 * bearish / total) if total else 0
+    summary = (
+        f"Bullish: {bullish} ({bull_pct}%) · "
+        f"Bearish: {bearish} ({bear_pct}%) · "
+        f"Unlabeled: {unlabeled} · "
+        f"Total: {total} most-recent messages"
+    )
+    return summary + "\n\n" + "\n".join(lines)