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/strategy/bayesian.py

@@ -503,7 +503,10 @@ class BayesianStrategy:
         # Phase 3: caller has pre-sorted markets by gnews_priority() so the
         # highest-value markets reach this block first.
         news_log_adj = 0.0
-        if is_politics and self._news is not None:
+        # self._news.enabled gates the whole block: with no GNews API key the
+        # client is a no-op, so we must not consume (or report) query budget for
+        # it — see NewsClient.enabled.
+        if is_politics and self._news is not None and self._news.enabled:
             if self._news_queries_this_cycle < MAX_NEWS_QUERIES_PER_CYCLE:
                 self._news_queries_this_cycle += 1
                 sentiment = await self._news.get_sentiment(market.question)