chore: remove dead functions and write-only state (no behaviour change)

Zero callers anywhere (tests included), verified by grep/AST:
- dashboard_publisher.DashboardPublisher.publish_all (run_cycle inlines both publishes)
- signal_log.SignalLogger.advance_with_bars (the backfill script uses
  backfill_seeds / resolve_from_store / reseed_unresolvable) and the never-read
  SignalLogger.path property plus its write-only self._path
- llm_client.reset_llm_client (tests reset the singleton by assignment)
- market_outlook._last_run_ts, residue of the old "now - last < 3600" dedup;
  _last_run_hour (the UTC hour bucket) is the live key
- news_engine FundamentalContext.event_impact_on_pairs: written once, read by
  nothing; its only feeder NewsEngine._get_affected_pairs and that helper's
  unit test go with it
- position_sizing.LIVE_DEPTH_BARS (referenced only by its own docstring, which
  now states the depths inline), the unused Iterable import and the unused
  atr_ok parameter of _fill_geometry
- analyze_signal_log: unused `field` import and the unused `rows` parameter of
  persona_scorecard / news_outcome_buckets (both read the DB directly)

The two backfill/label scripts' --db help text now names the config.json
setting it actually falls back to.

Suite: 463 passed, 0 failed (one test removed with its subject).

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

position_sizing.py

@@ -10,11 +10,11 @@ inputs (rule 4: live == backtest parity).
 Design contract
 ---------------
 * **Bounded lookbacks.** No feature may read further back than the live
-  fetch depth of its timeframe (``LIVE_DEPTH_BARS``). The primary frame
-  is hard-capped at ``MAX_LOOKBACK_BARS`` rows, confirmation frames at
-  60 rows, and the burst scan at 200 rows, so a feature computed on a
-  full backtest frame equals the same feature computed on the shorter
-  live tail.
+  fetch depth of its timeframe (5000 bars on M5/M15, 1460 on H1, 380 on
+  H4). The primary frame is hard-capped at ``MAX_LOOKBACK_BARS`` rows,
+  confirmation frames at 60 rows, and the burst scan at 200 rows, so a
+  feature computed on a full backtest frame equals the same feature
+  computed on the shorter live tail.
 * **Closed bars only.** The frames handed in are exactly the frames
   ``analyze_from_dataframes`` received: UTC tz-aware, oldest-first,
   capitalized OHLCV columns, forming candle already dropped. The last
@@ -46,7 +46,7 @@ import json
 import logging
 import math
 from pathlib import Path
-from typing import Dict, Iterable, Optional, Sequence, Tuple
+from typing import Dict, Optional, Sequence, Tuple
 
 import numpy as np
 import pandas as pd
@@ -60,17 +60,6 @@ logger = logging.getLogger(__name__)
 #: A trained artifact carrying a different value is ignored.
 FEATURE_VERSION = 1
 
-#: Bars each timeframe actually holds in LIVE mode. Any feature whose
-#: lookback exceeds its timeframe's depth here would be unreproducible
-#: live, so the windows below stay far inside these numbers.
-LIVE_DEPTH_BARS: Dict[Timeframe, int] = {
-    Timeframe.M5: 5000,
-    Timeframe.M15: 5000,
-    Timeframe.H1: 1460,
-    Timeframe.H4: 380,
-    Timeframe.D1: 300,
-}
-
 #: Hard cap on any primary-timeframe window used in this module.
 MAX_LOOKBACK_BARS = 500
 
@@ -338,7 +327,7 @@ def _fill_time(out: Dict[str, float], dt: pd.Timestamp) -> None:
 
 
 def _fill_geometry(out: Dict[str, float], P: pd.DataFrame, setup,
-                   atr: float, atr_ok: bool, norm, d: float) -> None:
+                   atr: float, norm, d: float) -> None:
     out["f_atr"] = max(0.0, _finite(atr))
     ranges = (P["High"] - P["Low"]).astype(float)
     last_range = _finite(ranges.iloc[-1])
@@ -566,7 +555,7 @@ def build_features(
 
         for step, args in (
             (_fill_time, (out, decision_time(P, primary_tf))),
-            (_fill_geometry, (out, P, setup, atr, atr_ok, norm, d)),
+            (_fill_geometry, (out, P, setup, atr, norm, d)),
             (_fill_exhaustion, (out, report, KL, px, d, norm)),
             (_fill_quality, (out, report, setup, IND, d)),
             (_fill_mtf, (out, report, primary_tf, confirmation_tfs, d)),