docs: update architecture and README for improved clarity and structure

- Revised the architecture document to enhance clarity on system overview, trading decision process, and technical stack.
- Updated the README to emphasize the bot's operational guidelines and risk management features.
- Added new sections in the architecture document detailing the trading decision gates and data pipeline flow.
- Improved the table of contents for better navigation and understanding of the bot's architecture.

results/weekly/report_2026-03-07.json

@@ -62,7 +62,7 @@
   },
   "live_trades": {
     "count": 0,
-    "net_pnl": 0,
+    "net_pnl": 0.0,
     "win_rate": 0
   },
   "trend": {
@@ -85,7 +85,7 @@
     },
     "met_count": 0,
     "recommend": false,
-    "cumulative_trades": 88,
+    "cumulative_trades": 0,
     "threshold": 150
   },
   "sweep": null