Oanda demo daemon: auto-execution on practice account (XAU/USD)

New independent trading daemon (oanda_daemon.py) that places orders on
an Oanda v20 practice account instead of sending Telegram alerts.
Oanda-only market data (oanda_provider.py, mid candles + real bid/ask
spread) through the unchanged signal pipeline; order execution and
trade management via oanda_executor.py (raw requests, no new deps).

Book parity with the backtester: no broker-side TP (exits = SL/TRAIL/
TIMEOUT only), bar-close-only trail ratchet with each closed bar
processed exactly once, 5-bar per-TF entry cooldown, structural SL
from the setup. Accepted divergence: one position total (skipped
signals logged for book reconciliation).

Safety/ops: fail-fast boot on rejected credentials (transient outages
continue), market orders never retried (double-fill risk), entry lock
against aligned-boundary races, restart recovery + adoption via
oanda_state.json, hourly heartbeat, asyncio exception handler, every
failure path logged. Prices formatted at instrument precision.

Config: env OANDA_* -> config.json "oanda" section (validated in
app_config). Tests: Module 15 (30 tests), suite 240 green.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VUnCqjWBuvKRSjLwHeB9BJ

app_config.py

@@ -85,7 +85,11 @@ _VALID_LOG_LEVELS = ("DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL")
 # AUTOSCAN_CONFIRMATIONS entries in telegram_bot.py).
 _SCANNABLE_TFS = ("M5", "M15", "H1", "H4")
 
-_KNOWN_TOP = {"telegram", "data_providers", "scanning", "pairs", "log_level"}
+_KNOWN_TOP = {"telegram", "data_providers", "scanning", "pairs", "log_level", "oanda"}
+_KNOWN_OANDA = {
+    "account_id", "api_token", "base_url", "lot_size",
+    "quality_gate", "max_hold_bars",
+}
 _KNOWN_TELEGRAM = {"token", "chat_id", "channel_id", "alert_min_quality"}
 _KNOWN_SCANNING = {"pairs", "timeframes"}
 _KNOWN_PAIR_KEYS = {"blocked_hours_utc"}
@@ -107,6 +111,7 @@ class AppConfig:
     scan_timeframes: List[Timeframe] = field(default_factory=lambda: [
         Timeframe.M5, Timeframe.M15, Timeframe.H1, Timeframe.H4])
     pair_overrides: Dict[str, Dict[str, Any]] = field(default_factory=dict)
+    oanda_settings: Dict[str, Any] = field(default_factory=dict)
     log_level: str = "INFO"
 
 
@@ -212,6 +217,24 @@ def load_app_config(path: str = CONFIG_PATH) -> AppConfig:
                     "be a list of integers in 0-23")
     app.pair_overrides = {s: dict(o) for s, o in pair_section.items()}
 
+    oanda = raw.get("oanda", {})
+    _check_keys(oanda, _KNOWN_OANDA, '"oanda"')
+    if "lot_size" in oanda:
+        ls = oanda["lot_size"]
+        if not isinstance(ls, int) or isinstance(ls, bool) or ls < 1:
+            raise AppConfigError(
+                "config.json: oanda.lot_size must be a positive integer")
+    if "quality_gate" in oanda and oanda["quality_gate"] not in _VALID_QUALITIES:
+        raise AppConfigError(
+            f'config.json: oanda.quality_gate "{oanda["quality_gate"]}" '
+            f"not in {_VALID_QUALITIES}")
+    if "max_hold_bars" in oanda:
+        mhb = oanda["max_hold_bars"]
+        if not isinstance(mhb, int) or isinstance(mhb, bool) or mhb < 1:
+            raise AppConfigError(
+                "config.json: oanda.max_hold_bars must be a positive integer")
+    app.oanda_settings = dict(oanda)
+
     level = raw.get("log_level", app.log_level)
     if level not in _VALID_LOG_LEVELS:
         raise AppConfigError(
@@ -271,6 +294,26 @@ def provider_api_key(app: Optional[AppConfig] = None) -> str:
     return str(block.get("api_key", ""))
 
 
+# ── Oanda resolution helpers (env → config.json → default) ───────────
+
+def oanda_account_id(app: Optional[AppConfig] = None) -> str:
+    app = app or get_app_config()
+    return os.environ.get("OANDA_ACCOUNT_ID") or str(
+        app.oanda_settings.get("account_id", ""))
+
+
+def oanda_api_token(app: Optional[AppConfig] = None) -> str:
+    app = app or get_app_config()
+    return os.environ.get("OANDA_API_TOKEN") or str(
+        app.oanda_settings.get("api_token", ""))
+
+
+def oanda_base_url(app: Optional[AppConfig] = None) -> str:
+    app = app or get_app_config()
+    return os.environ.get("OANDA_BASE_URL") or str(
+        app.oanda_settings.get("base_url", "https://api-fxpractice.oanda.com"))
+
+
 # ── PlatformConfig overlay ────────────────────────────────────────────
 
 def apply_pair_overrides(