feat(kol-v2): fix soft-signal recall — bullish/bearish over mention, category tickers

Two failure modes addressed:

1. Soft/indirect bullish signals classified as 'mention' instead of 'bullish'
   The prompt now explicitly lists casual English and Chinese expressions that
   count as bullish/bearish (not mention):
   - EN: 'looks interesting here', 'has room to run', 'wouldn't be short'
   - ZH: '感觉还有空间', '可以关注', '这里不错', '有上涨空间'
   mention is now reserved for ZERO directional lean (historical refs, neutral
   examples). Previously the vague boundary caused the model to use mention
   conservatively, losing real signals.

2. Category-level calls lost when no specific ticker named
   'memecoin season', 'memes look good', '梗币最近不错' had no ticker to attach
   to. Added synthetic tickers: MEME, ALTCOIN, DEFI, AI — the model uses these
   when the view is about the category, not a specific coin.
   Normalizer allows synthetic tickers through the len>12 guard.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/services/kol_analysis.py

@@ -107,10 +107,28 @@ TICKERS:
 - action values:
     "buy"/"sell"   → author explicitly states a position action ("I bought", "we are long", "我们减仓了", "added to my bag", "taking profits", "已建仓", "我加仓了", "建了仓")
     "reduce"       → partially exiting or taking profits on an existing long ("trimming", "taking some off", "减了一部分", "止盈了一些")
-    "bullish"/"bearish" → directional view without explicit position statement
-    "mention"      → ticker appears but no clear stance — use sparingly, only when ticker is central to the post
+    "bullish"      → ANY expression of upside view, including SOFT/INDIRECT/CASUAL language. Err on the side of bullish over mention.
+                     English soft bullish: "X looks interesting here", "I like X at these levels", "X has room to run",
+                     "wouldn't be short X", "X is setting up well", "compelling setup in X", "X is undervalued",
+                     "I'd be a buyer of X", "X deserves attention here", "keeping an eye on X"
+                     Chinese soft bullish: "感觉还有空间", "这里可以关注", "值得关注", "看好", "还有机会",
+                     "这个位置不错", "可以考虑", "有上涨空间", "这波不错", "可以关注一下", "挺有意思的"
+    "bearish"      → ANY expression of downside view or caution, including soft signals.
+                     English soft bearish: "X looks extended", "I'd be careful here", "not touching X",
+                     "X has further to fall", "selling into strength on X", "X is a trap"
+                     Chinese soft bearish: "感觉要跌", "要小心", "不敢碰", "还会跌", "高位了", "风险很大"
+    "mention"      → ticker appears but author has ZERO directional lean — pure neutral reference,
+                     historical context only, or just used as an example. If there is ANY lean at all,
+                     use bullish or bearish instead. Reserve mention for truly neutral uses like:
+                     "BTC started in 2009" or "unlike ETH, which uses proof-of-stake"
 - Dedupe per ticker — at most one entry per symbol; pick the strongest action.
 - Do NOT invent tickers. Skip "$XYZ" if unsure it is a real crypto token.
+- For CATEGORY-LEVEL calls (no specific ticker named), use these synthetic tickers:
+    "MEME"    → author is bullish/bearish on memecoins as a category ("memes look good", "memecoin season", "梗币最近不错")
+    "ALTCOIN" → author is bullish/bearish on altcoins broadly ("alts are waking up", "山寨季", "altseason")
+    "DEFI"    → author is bullish/bearish on DeFi protocols broadly
+    "AI"      → author is bullish/bearish on AI-related tokens broadly
+  Only use synthetic tickers when the view is genuinely about the category, not just a passing mention.
 - conviction: 0.8+ = explicit + repeated + sized or timed; 0.5–0.7 = clear view, no commitment; <0.5 = passing reference.
 - timeframe: "immediate" = acting now or within 24h; "days" = 1–7d; "weeks" = 1–4w; "months" = 1+ months; "unspecified" = not stated.
 - Do not include fiat (USD/CNY/JPY) or stablecoins (USDT/USDC/DAI/FRAX/USDE) unless the post's main thesis is about them.
@@ -246,12 +264,19 @@ async def extract_kol_signal(
     valid_actions = {"buy", "sell", "reduce", "bullish", "bearish", "mention"}
     valid_timeframes = {"immediate", "days", "weeks", "months", "unspecified"}
     valid_post_types = {"trade_update", "macro_thesis", "research", "news_recap", "opinion", "other"}
+    # Synthetic category tickers — allowed even though they're not real on-chain tokens.
+    # Used when the KOL expresses a view on a category without naming specific coins.
+    SYNTHETIC_TICKERS = {"MEME", "ALTCOIN", "DEFI", "AI"}
 
     for t in tickers:
         if not isinstance(t, dict):
             continue
         sym = (t.get("ticker") or "").strip().upper()
-        if not sym or len(sym) > 12:
+        if not sym:
+            continue
+        # Allow synthetic category tickers; reject anything else > 12 chars
+        # (12 chars covers most real tickers; synthetic ones are all ≤ 7 chars)
+        if sym not in SYNTHETIC_TICKERS and len(sym) > 12:
             continue
         action = (t.get("action") or "mention").lower()
         if action not in valid_actions: