fix(news): strip GNews operator dashes and stop phantom query-budget counting

Two minor faults found during the GNews capture/prioritisation diagnostic:

1. Hyphens/dashes reached the GNews query verbatim. '-' is GNews's exclusion
   operator, so a token like "El-Sayed" returned HTTP 400 and wasted a query.
   _PUNCT_RE now strips '-', en dash and em dash to spaces.

2. The per-cycle GNews budget counter incremented in evaluate() before
   get_sentiment() checked the API key, so with no key configured the
   [CYCLE SUMMARY] reported a phantom "gnews_queries_used: 5/5" with zero real
   requests. Added NewsClient.enabled and gated the GNews block on it; with no
   key the counter stays 0/5 and no spurious SKIP_GNEWS_PRIORITY is logged.
   No behaviour change when a key is present.

Prioritisation itself was confirmed correct and is left untouched: politics
markets are sorted by gnews_priority DESC and prior-extreme markets return
before the budget is consumed, so no query is ever spent on a market that
cannot trade.

Tests: tests/test_news_query.py (4 new); full suite 66 passed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

bot/data/news.py

@@ -51,7 +51,11 @@ _DATE_RE = re.compile(
     r"|\bQ[1-4]\b",
     flags=re.IGNORECASE,
 )
-_PUNCT_RE = re.compile(r"[?!\"'.,;:()\[\]{}]")
+# Hyphens/dashes are GNews query operators (a leading '-' means "exclude the
+# next term"), so a token like "El-Sayed" makes the API return HTTP 400.  Strip
+# them to spaces along with the rest of the punctuation so the query stays a
+# plain keyword list.  – = en dash, — = em dash.
+_PUNCT_RE = re.compile(r"[?!\"'.,;:()\[\]{}\-–—]")
 
 
 class NewsClient:
@@ -79,6 +83,18 @@ class NewsClient:
     # Public API
     # ------------------------------------------------------------------
 
+    @property
+    def enabled(self) -> bool:
+        """True only when a GNews API key is configured.
+
+        When False, get_sentiment() is a no-op that returns 0.0 without any
+        network call, so callers must skip GNews entirely — including the
+        per-cycle query budget accounting — instead of "spending" a query that
+        never reaches the API (which inflated gnews_queries_used to a phantom
+        5/5 while the key was missing).
+        """
+        return bool(self._api_key)
+
     async def get_sentiment(self, question: str) -> float:
         """
         Return a sentiment score ∈ [-1.0, +1.0] for the market question.