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

docs/architecture_diagram.py

@@ -130,13 +130,6 @@ box(31, 33.2, 38, 5.2, "SignalReport",
 band(1, 13.2, 98, 17.2, "DELIVERY SURFACES", "#4C8F50")
 box(2.5, 15.0, 12, 12.6, "main.py",
     ["CLI report", "--detail", "--json"], DEL_FC, DEL_EC)
-box(16, 15.0, 24, 12.6, "oanda_daemon.py + executor",
-    ["practice auto-execution",
-     "book-parity rules: no broker TP,",
-     "5-bar cooldown, once-per-bar",
-     "trail, OPEN_ONLY fills,",
-     "boot reconcile · orders → Oanda"],
-    DEL_FC, DEL_EC, title_fs=7.8)
 box(42.5, 15.0, 31, 12.6, "dashboard_publisher.py  →  Apache",
     ["independent daemon · scans at candle closes",
      "atomic publish to /var/www/trade:",
@@ -170,7 +163,6 @@ arrow((55, 69.8), (55, 63.1), label="warn-only context", lx=0, ly=1.0)
 arrow((86, 69.8), (86, 67.3), ls=(0, (3, 2)), lw=1.1)                  # config → core
 arrow((50, 40.5), (50, 38.8))                                          # core → report
 arrow((36, 34.5), (8.5, 27.95), conn="arc3,rad=0.12")                  # report → cli
-arrow((40, 33.2), (28, 27.95), conn="arc3,rad=0.06")                   # report → daemon
 arrow((60, 33.2), (58, 27.95))                                         # report → dashboard
 arrow((66, 34.5), (86.5, 27.95), conn="arc3,rad=-0.12")                # report → telegram
 
@@ -181,7 +173,6 @@ arrow((95, 86.2), (95, 27.95), conn="arc3,rad=0.15", color=HAUL,
 ax.text(99.2, 57, "alerts / commands", fontsize=6.4, color=MUT,
         rotation=90, ha="center", va="center")
 # browser click → news_summary.php → DeepSeek
-# (oanda_daemon's order flow is noted inside its box — no long arc)
 arrow((66, 27.95), (73, 86.2), conn="arc3,rad=-0.18", color=HAUL,
       lw=1.2, ls=(0, (4, 2)),
       label="on-demand AI summary\n(browser click → PHP)", lx=2.5, ly=11.6)