Remove Oanda auto-execution daemon/executor (not auto-trading)

Deletes oanda_daemon.py, oanda_executor.py, their 28 tests and the daemon-only
config keys (oanda.lot_size/quality_gate/max_hold_bars). The Oanda data
provider and credentials stay — it is the live candle feed. 402 tests.

Claude-Session: https://claude.ai/code/session_01FC4s6VCURFte4dub4xKxYL

app_config.py

@@ -89,8 +89,7 @@ _KNOWN_TOP = {"telegram", "data_providers", "scanning", "pairs", "log_level",
                "oanda", "deepseek", "agent_panel", "market_outlook",
                "signal_log"}
 _KNOWN_OANDA = {
-    "account_id", "api_token", "base_url", "lot_size",
-    "quality_gate", "max_hold_bars",
+    "account_id", "api_token", "base_url",
 }
 _KNOWN_DEEPSEEK = {
     "api_key", "model", "enabled", "timeout_seconds", "daily_request_cap",
@@ -256,20 +255,6 @@ def load_app_config(path: str = CONFIG_PATH) -> AppConfig:
 
     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)
 
     deepseek = raw.get("deepseek", {})