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

dashboard_publisher.py

@@ -11,9 +11,9 @@ can only ever mean a stale page.
 Independence rules (owner requirement — the telegram bot must be
 immune to anything on the web side):
   * Runs as its own process; never imported by, and never imports,
-    `telegram_bot` / `oanda_daemon` (telegram_bot resolves credentials
-    at import). The confirmation map and boundary math are therefore
-    duplicated here as local constants.
+    `telegram_bot` (telegram_bot resolves credentials at import). The
+    confirmation map and boundary math are therefore duplicated here
+    as local constants.
   * The only shared-code dependency beyond the standard signal path is
     the additive `NewsEngine.get_week_events` accessor, which no
     production signal path calls.
@@ -236,8 +236,8 @@ def due_timeframes(wake_dt: datetime) -> List[Timeframe]:
 
 
 def seconds_until_boundary(interval_minutes: int, buffer: int = 10) -> float:
-    # Same math as telegram_bot.py / oanda_daemon.py — kept local so the
-    # dashboard never imports bot modules (independence rules above).
+    # Same math as telegram_bot.py — kept local so the dashboard never
+    # imports bot modules (independence rules above).
     now = datetime.now(timezone.utc)
     total_minutes = now.hour * 60 + now.minute
     elapsed_minutes = total_minutes % interval_minutes