chore: remove test-only helpers and the duplicate confirmation map (no behaviour change)

- telegram_bot._format_scan_summary: multi-pair "auto-scan summary" leftover;
  production sends per-report format_signal_message. Its only caller was a test.
- telegram_bot.scan_keyboard: thin wrapper only a test called; main_menu_keyboard
  already builds from _scan_button_rows directly.
- telegram_bot.AUTOSCAN_CONFIRMATIONS was byte-identical to TF_CONFIRMATIONS;
  the candle loop now reads the one map (app_config comment updated).
- SignalLogger.news_for: one-line wrapper over the module-level read_news that
  every real reader uses; the test now calls read_news like its neighbours.
- pair_signals.get_supported_pairs: PAIR_PRODUCERS is the registry; the test
  lists it directly.

Suite: 461 passed, 0 failed (two helper-only tests removed).

Claude-Session: https://claude.ai/code/session_0156YhogLytzj9P2iH1skGbL

telegram_bot.py

@@ -188,13 +188,6 @@ TF_CONFIRMATIONS = {
     Timeframe.H4:  [Timeframe.H1, Timeframe.D1],
 }
 
-AUTOSCAN_CONFIRMATIONS = {
-    Timeframe.M5:  [Timeframe.M15, Timeframe.H1],
-    Timeframe.M15: [Timeframe.M5, Timeframe.H1],
-    Timeframe.H1:  [Timeframe.M15, Timeframe.H4],
-    Timeframe.H4:  [Timeframe.H1, Timeframe.D1],
-}
-
 _executor = ThreadPoolExecutor(max_workers=4)
 
 # ── Markdown escaping ─────────────────────────────────────────────────
@@ -441,37 +434,6 @@ def format_signal_message(report: SignalReport) -> str:
     return "\n".join(lines)
 
 
-# ── Auto-scan summary format ─────────────────────────────────────────
-
-def _format_scan_summary(reports: List[SignalReport], tf: Timeframe) -> str:
-    now = datetime.now(timezone.utc).strftime("%H:%M UTC")
-    lines = [
-        f"📊 *{tf.value} Auto-Scan* | {now}",
-        "━━━━━━━━━━━━━━━━━━━━",
-    ]
-    for r in reports:
-        emoji = _SIGNAL_EMOJI.get(r.final_signal, "⬜")
-        sig = _signal_label(r.final_signal)
-        mtf = "✅" if r.mtf_agreement else "❌"
-        lines.append(
-            f"{emoji} *{r.display_name}*  {sig}  "
-            f"{_QUALITY_EMOJI.get(r.signal_quality, '')}{r.signal_quality}  "
-            f"{r.final_score:+.1f}  {r.final_confidence:.0f}%  {mtf}MTF"
-        )
-    lines.append("━━━━━━━━━━━━━━━━━━━━")
-
-    actionable = [r for r in reports if r.signal_quality in ("A+", "A", "B", "C")]
-    if actionable:
-        names = ", ".join(r.display_name for r in actionable)
-        lines.append(f"🔔 Actionable: {names}")
-    else:
-        lines.append("No actionable signals this cycle.")
-
-    lines += ["", _DISCLAIMER]
-
-    return "\n".join(lines)
-
-
 # ── Keyboard helper ───────────────────────────────────────────────────
 
 def _scan_button_rows() -> List[List[InlineKeyboardButton]]:
@@ -490,10 +452,6 @@ def _scan_button_rows() -> List[List[InlineKeyboardButton]]:
     return rows
 
 
-def scan_keyboard() -> InlineKeyboardMarkup:
-    return InlineKeyboardMarkup(_scan_button_rows())
-
-
 def main_menu_keyboard() -> InlineKeyboardMarkup:
     """Full interactive menu: scans + settings + status in one keyboard."""
     autoscan_label = "🔔 Auto-scan: ON" if _autoscan_chats else "🔕 Auto-scan: OFF"
@@ -1147,7 +1105,7 @@ async def _candle_loop(bot, tf: Timeframe, interval_minutes: int) -> None:
             logger.info(f"{label} auto-scan: firing")
             try:
                 await _scan_timeframe(
-                    bot, tf, AUTOSCAN_CONFIRMATIONS[tf]
+                    bot, tf, TF_CONFIRMATIONS[tf]
                 )
             except Exception:
                 # One failed cycle must not kill the loop for good —