fix(shadbala): Sun minimum requirement is 6.5 rupas per BPHS ch. 27 sl. 32-33 (BUG-1189, F3)

BPHS ch. 27 (Evaluation of Strengths) sl. 32-33 gives 390, 360, 300, 420, 390,
330 and 300 virupas for Sun..Saturn; the Sun was 5.0. MIN_REQUIRED in
scripts/shadbala.py is the only requirement table in our code (the 5.0 default
in .get() is for unknown bodies; vendored jyotishganit / dashaflow tables
already say 6.5). Upstream yinduzhanxing 0a6696c5 still has 5.0 (to notify).
Product decision 2026-10-02 (added to TASK-upstream-sync4-20261002).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

scripts/shadbala.py

@@ -98,9 +98,12 @@ NAISARGIKA_BALA = {
     'Jupiter': 34.29, 'Mercury': 25.71, 'Mars': 17.14, 'Saturn': 8.57
 }
 
-# Shadbala 最低要求（Rupas）
+# Shadbala 最低要求（Rupas）。BPHS 第 27 章（Evaluation of Strengths）第 32–33 颂：
+# 「390, 360, 300, 420, 390, 330 and 300 Virupas are the Shad Bal Pindas, needed for
+# Sūrya etc. to be considered strong」，即日月火水木金土 6.5/6/5/7/6.5/5.5/5 Rupa。
+# 太阳原写 5.0（BUG-1189，清单 F3）；上游 yinduzhanxing 0a6696c5 仍是 5.0。
 MIN_REQUIRED = {
-    'Sun': 5.0, 'Moon': 6.0, 'Mars': 5.0,
+    'Sun': 6.5, 'Moon': 6.0, 'Mars': 5.0,
     'Mercury': 7.0, 'Jupiter': 6.5, 'Venus': 5.5, 'Saturn': 5.0
 }