fix(report): draw North Indian charts from fences after skipHtml dropped SVG

Longform report pages kept the D1/D9/Moon and varga headings but skipHtml
stripped the engine's inline SVG. Emit a jyotish-chart JSON fence beside
each SVG and render a diamond chart on the reader without relaxing HTML
sanitization. BUG-607.

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

scripts/chart_renderer.py

@@ -7,6 +7,7 @@
 支持：D1(本命)/D9(Navamsa)/D10(Dasamsa)等分盘
 """
 
+import re
 from typing import Dict, List, Optional
 
 SIGNS = ['Aries', 'Taurus', 'Gemini', 'Cancer', 'Leo', 'Virgo',
@@ -55,6 +56,21 @@ GRID_OFFSET_X = 50
 GRID_OFFSET_Y = 50
 SVG_WIDTH = GRID_OFFSET_X * 2 + CELL_SIZE * 4
 SVG_HEIGHT = GRID_OFFSET_Y * 2 + CELL_SIZE * 4 + 60
+_D_ID_RE = re.compile(r"\b(D\d{1,3})\b")
+
+
+def _center_caption(title: str) -> tuple[str, str]:
+    """Keep D1 as ``Rasi Chart / (D1)``; other titles follow the heading id."""
+    moon = bool(re.search(r"Moon", title, re.I))
+    match = _D_ID_RE.search(title or "")
+    chart_id = match.group(1) if match else None
+    if chart_id == "D1" and not moon:
+        return "Rasi Chart", "(D1)"
+    if moon:
+        return "Chart", "(Moon)"
+    if chart_id:
+        return "Chart", f"({chart_id})"
+    return "Chart", ""
 
 
 def render_south_indian_chart(planets: Dict, asc_sign: str, title: str = "D1 — Rashi Chart") -> str:
@@ -117,8 +133,10 @@ def render_south_indian_chart(planets: Dict, asc_sign: str, title: str = "D1 —
     # 中心区域（传统上写星盘信息）
     cx = GRID_OFFSET_X + 1.5 * CELL_SIZE
     cy = GRID_OFFSET_Y + 1.5 * CELL_SIZE
-    lines.append(f'<text x="{cx}" y="{cy-5}" text-anchor="middle" font-size="10" fill="#999">Rasi Chart</text>')
-    lines.append(f'<text x="{cx}" y="{cy+12}" text-anchor="middle" font-size="10" fill="#999">(D1)</text>')
+    caption, chart_id = _center_caption(title)
+    lines.append(f'<text x="{cx}" y="{cy-5}" text-anchor="middle" font-size="10" fill="#999">{caption}</text>')
+    if chart_id:
+        lines.append(f'<text x="{cx}" y="{cy+12}" text-anchor="middle" font-size="10" fill="#999">{chart_id}</text>')
 
     lines.append('</svg>')
     return '\n'.join(lines)