v4: Bitcoin Accumulation Zone Monitor — on-chain metrics + backtest engine

COMPLETE PIVOT from ML trading optimizer to on-chain metrics monitor.

Architecture:
- Playwright scrapes LookIntoBitcoin Plotly Dash charts for real on-chain data
- 10 proven metrics: Puell Multiple, MVRV Z-Score, Fear & Greed, Reserve Risk,
  RHODL Ratio, NUPL, LTH Realized Price, 200W SMA, Hash Ribbons, Drawdown
- Each metric scores 0-10, composite 0-100
- No ML, no black box — every signal transparent and traceable
- Historical backtest validates scoring against actual BTC forward returns
- Recency-weighted analysis accounts for diminishing cycle returns

Full documentation in ARCHITECTURE.md

config/current_config.json

@@ -7,7 +7,7 @@
     "use_volume": true,
     "use_cycle": true,
     "use_pca": false,
-    "pca_variance": 0.95,
+    "pca_variance": 0.85,
     "use_scaler": true
   },
   "target": {
@@ -33,31 +33,31 @@
     ]
   },
   "hyperparameters": {
-    "learning_rate": 0.01,
-    "max_depth": 4,
-    "n_estimators": 300,
-    "subsample": 0.8,
-    "colsample_bytree": 0.8,
-    "min_child_weight": 20,
-    "gamma": 0.3,
-    "reg_alpha": 0.5,
-    "reg_lambda": 3.0,
-    "lstm_hidden_size": 128,
+    "learning_rate": 0.005,
+    "max_depth": 5,
+    "n_estimators": 800,
+    "subsample": 0.7,
+    "colsample_bytree": 0.7,
+    "min_child_weight": 15,
+    "gamma": 0.5,
+    "reg_alpha": 0.3,
+    "reg_lambda": 1.0,
+    "lstm_hidden_size": 64,
     "lstm_num_layers": 2,
-    "lstm_dropout": 0.3,
-    "lstm_epochs": 100,
+    "lstm_dropout": 0.4,
+    "lstm_epochs": 80,
     "lstm_batch_size": 64,
     "lstm_sequence_length": 30,
-    "lstm_patience": 10
+    "lstm_patience": 15
   },
   "strategy": {
-    "strong_buy_threshold": 65,
-    "good_buy_threshold": 55,
-    "poor_threshold": 35
+    "strong_buy_threshold": 55,
+    "good_buy_threshold": 35,
+    "poor_threshold": 20
   },
   "training": {
     "rolling_window": true,
-    "rolling_train_size": 2500,
+    "rolling_train_size": 3500,
     "rolling_test_size": 300,
     "walk_forward_windows": 5,
     "train_pct": 0.7,