Normalize fullwidth punctuation to ASCII across codebase.

Add scripts/normalize_ambiguous_unicode.py; fix corrupted patch_instance_theme_templates.py. Preserves curly quotes in string literals; removes Git homoglyph warnings on .env.example.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_hub_divergence_scan_lib.py

@@ -10,7 +10,7 @@ from lib.hub.hub_divergence_scan_lib import (
 
 
 def _synthetic_bull_div_closes(n: int = 120) -> list[float]:
-    """价格双底 + MACD 抬高 → 底背离。"""
+    """价格双底 + MACD 抬高 → 底背离."""
     closes = [100.0] * n
     # 下跌
     for i in range(20, 40):
@@ -84,7 +84,7 @@ class TestHubDivergenceScanLib(unittest.TestCase):
     def test_detect_macd_divergence_may_hit_on_synthetic(self):
         closes = _synthetic_bull_div_closes()
         hit = detect_latest_macd_divergence(closes)
-        # 合成数据不保证必中，但函数应正常返回
+        # 合成数据不保证必中,但函数应正常返回
         self.assertIn(hit.get("direction"), (None, "bull", "bear"))
 
     def test_analyze_ohlcv_bars_from_rows(self):