Add sync-ea-inputs: durable fix for the chart-cache persistence bug

Root cause: MT5 actually reads live EA inputs from
MQL5/Profiles/Charts/Default/chartNN.chr at boot, not from the .set
presets -- and it never rewrites that file on container shutdown
(files were found frozen at their Aug 6 mtimes through every restart
since, including graceful ones with stop_grace_period). This is why
the XAUUSD spread-filter fix (Jul 30) and the Monday A/B reversion
(Aug 10) both kept reverting after restarts.

sync-ea-inputs.sh (+ .py) runs on every container boot via
custom-cont-init.d, before MT5 launches, and writes each chart's
matching bo-*.set values directly into its .chr cache -- bypassing
MT5's broken save-on-exit path entirely. Validated with a real
corrupt-then-restart-then-verify cycle (see vault note).

Deployed copy lives at ~/mt5-docker/custom-cont-init.d/ (mt5-docker
is not a git repo); this is the tracked source, kept in sync with the
deployed version by hand like the other scripts here (e.g.
export-history.sh).

scripts/sync-ea-inputs.py

@@ -0,0 +1,107 @@
+#!/usr/bin/env python3
+"""Syncs authoritative bo-*.set preset values into MT5's actual live-session
+cache files (MQL5/Profiles/Charts/Default/chartNN.chr).
+
+Root cause (found 2026-08-10): MT5's "save chart state on graceful exit"
+never actually fires under this Wine/container setup -- chartNN.chr files
+were found frozen at their 2026-08-06 23:26 mtimes despite many later
+restarts, including ones using the documented `stop_grace_period: 60s` +
+`docker compose down` "graceful" path. Every restart since Aug 6 silently
+reloads that one frozen snapshot, which is why a live GUI input edit
+(Properties/F7 -> OK) reverts after the next restart no matter how
+"gracefully" the container is stopped. This hit the XAUUSD spread filter
+(Jul 30, Aug 6/7) and the Monday A/B reversion (Aug 10) alike -- general,
+not symbol-specific.
+
+Fix: don't rely on MT5 ever writing this file correctly. Treat the
+bo-*.set files (repo + Presets/) as the single source of truth and write
+them directly into chartNN.chr ourselves, every boot. chartNN.chr uses
+the exact same `Key=Value` input names as the .set files (verified), just
+UTF-16LE with a BOM and CRLF instead of the .set files' UTF-8/LF -- and
+one chart file per open chart, auto-mapped here via each file's own
+`symbol=` line rather than a hardcoded chart-number list, so this keeps
+working if charts are ever reordered.
+
+Idempotent -- safe to run any time, not just at boot.
+"""
+import glob
+import os
+import re
+import sys
+
+PRESETS_DIR = "/config/.wine/drive_c/Program Files/MetaTrader 5/MQL5/Presets"
+CHARTS_DIR = "/config/.wine/drive_c/Program Files/MetaTrader 5/MQL5/Profiles/Charts/Default"
+
+BOM = b"\xff\xfe"
+
+
+def load_preset(path):
+    values = {}
+    with open(path, "r", encoding="utf-8", errors="ignore") as f:
+        for line in f:
+            line = line.strip("\r\n")
+            if not line or line.startswith(";") or line.startswith("#"):
+                continue
+            if "=" not in line:
+                continue
+            key, _, value = line.partition("=")
+            values[key] = value
+    return values
+
+
+def sync_chart(chart_path):
+    with open(chart_path, "rb") as f:
+        raw = f.read()
+
+    if not raw.startswith(BOM):
+        return None, "no UTF-16LE BOM, skipping"
+
+    text = raw[len(BOM):].decode("utf-16-le", errors="replace")
+
+    m = re.search(r"^symbol=(\S+)\r?$", text, re.MULTILINE)
+    if not m:
+        return None, "no symbol= line found"
+    symbol = m.group(1)
+
+    preset_path = os.path.join(PRESETS_DIR, f"bo-{symbol.lower()}.set")
+    if not os.path.isfile(preset_path):
+        return symbol, f"no matching preset {preset_path}"
+
+    preset_values = load_preset(preset_path)
+
+    lines = text.split("\n")
+    changed = 0
+    for i, line in enumerate(lines):
+        body = line[:-1] if line.endswith("\r") else line
+        if "=" not in body:
+            continue
+        key, _, current_value = body.partition("=")
+        if key in preset_values and preset_values[key] != current_value:
+            lines[i] = f"{key}={preset_values[key]}\r"
+            changed += 1
+
+    if changed:
+        new_text = "\n".join(lines)
+        new_raw = BOM + new_text.encode("utf-16-le")
+        tmp_path = chart_path + ".tmp"
+        with open(tmp_path, "wb") as f:
+            f.write(new_raw)
+        os.replace(tmp_path, chart_path)
+
+    return symbol, f"{changed} value(s) synced from {os.path.basename(preset_path)}"
+
+
+def main():
+    if not os.path.isdir(CHARTS_DIR):
+        print(f"No charts dir at {CHARTS_DIR} -- nothing to sync yet.")
+        return 0
+
+    for chart_path in sorted(glob.glob(os.path.join(CHARTS_DIR, "chart*.chr"))):
+        symbol, msg = sync_chart(chart_path)
+        label = f"[{symbol}]" if symbol else ""
+        print(f"  {os.path.basename(chart_path)} {label}: {msg}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())