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

test_all.py

@@ -1612,9 +1612,9 @@ print("\n═══ Module 7: telegram_bot.py ═══")
 
 from telegram_bot import (
     _escape_md, _signal_label, _mtf_line, _indicator_summary,
-    format_signal_message, _format_scan_summary, _news_text,
+    format_signal_message, _news_text,
     _seconds_until_boundary, _check_level_breach,
-    scan_keyboard, SCAN_BUTTONS, SCAN_LOOKUP,
+    SCAN_BUTTONS, SCAN_LOOKUP,
     _update_level_cache, _last_prices, _level_cache, _level_cache_ts,
 )
 
@@ -1757,21 +1757,6 @@ def _():
     assert "[Bullish]" not in msg and "[Bearish]" not in msg and "[Neutral]" not in msg
 
 
-@test("_format_scan_summary produces valid text")
-def _():
-    config = PlatformConfig()
-    agg = SignalAggregator(config)
-    dfs = {
-        Timeframe.H1: make_ohlcv(300, seed=42),
-        Timeframe.M15: make_ohlcv(300, seed=43),
-        Timeframe.H4: make_ohlcv(300, seed=44),
-    }
-    reports = [agg.analyze_from_dataframes("XAU/USD", dfs, use_news=False)]
-    summary = _format_scan_summary(reports, Timeframe.H1)
-    assert "Auto-Scan" in summary
-    assert "XAU/USD" in summary
-
-
 @test("_seconds_until_boundary returns positive value")
 def _():
     result = _seconds_until_boundary(15, buffer=10)
@@ -1878,12 +1863,6 @@ def _():
         assert "label" in btn
 
 
-@test("scan_keyboard returns InlineKeyboardMarkup")
-def _():
-    kb = scan_keyboard()
-    assert kb is not None
-
-
 @test("_update_level_cache populates cache from reports")
 def _():
     config = PlatformConfig()
@@ -2070,7 +2049,7 @@ print("\n═══ Module 9: pair_signals registry ═══")
 @test("pair_signals registry includes XAU/USD only")
 def _():
     import pair_signals
-    pairs = pair_signals.get_supported_pairs()
+    pairs = list(pair_signals.PAIR_PRODUCERS)
     assert XAUUSD in pairs, f"XAU missing from registry: {pairs}"
     assert pairs == [XAUUSD], f"registry must be XAU-only: {pairs}"
 
@@ -8900,7 +8879,7 @@ def _():
         legacy_id = lg._conn.execute("SELECT MAX(id) FROM signals").fetchone()[0]
         ev, hl = slog.read_news(lg._conn, legacy_id)
         assert json.loads(hl)[0]["headline"] == "legacy"
-        ev, hl = lg.news_for(r1)
+        ev, hl = slog.read_news(lg._conn, r1)
         assert json.loads(hl)[0]["headline"] == "Fed signals rate hike"
         view = dict(lg._conn.execute(
             "SELECT id, headlines_resolved FROM signals_with_news").fetchall())