fix(dignity): Rahu/Ketu have no own sign; yoga main path uses fixed Scorpio/Aquarius lords (T5, BUG-1211)

Astrologer ruling 甲12. jyotish_engine._get_dignity_level drops the Rahu-Virgo /
Ketu-Pisces OWN_SIGN clause (fed the D1 status column, Vimsopaka and
varga_dignity); no node exaltation/debilitation added. yoga_engine.YogaContext
resolves Scorpio -> Mars and Aquarius -> Saturn by default (as the lord chain,
functional roles and frontend SIGN_LORDS do); _stronger_co_lord and
RAHU_KETU_OWNED_SIGN_INDEX stay for Jaimini variants (dynamic_co_lords=True) only.
narayana_dasha co-lord rules unchanged. Separate commit so it can be reverted alone;
v5 / reported-offset results in PROGRESS.

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

scripts/jyotish_engine.py

@@ -660,7 +660,10 @@ def _get_dignity_level(planet, sign, deg_in_sign=None, planets_data=None):
         if deg_in_sign is not None and mt[1] <= deg_in_sign < mt[2]:
             return 'MOOLATRIKONA'
             
-    if SIGN_LORDS.get(sign) == planet or (planet == 'Rahu' and sign == 'Virgo') or (planet == 'Ketu' and sign == 'Pisces'):
+    # BUG-1211 (ruling 甲12): Rahu and Ketu have no traditional own sign. The old
+    # Rahu-Virgo / Ketu-Pisces "own sign" fed the D1 status column, Vimsopaka and
+    # varga_dignity; neither Virgo nor Aquarius is shown as Rahu's own sign now.
+    if SIGN_LORDS.get(sign) == planet:
         return 'OWN_SIGN'
         
     if DEBILITATION.get(planet) == sign:

scripts/yoga_engine.py

@@ -67,6 +67,7 @@ FIXED_SIGNS = ['Taurus', 'Leo', 'Scorpio', 'Aquarius']
 DUAL_SIGNS = ['Gemini', 'Virgo', 'Sagittarius', 'Pisces']
 ALL_PLANETS = ['Sun', 'Moon', 'Mars', 'Mercury', 'Jupiter', 'Venus', 'Saturn', 'Rahu', 'Ketu']
 PLANET_INDEX = {planet: idx for idx, planet in enumerate(ALL_PLANETS)}
+# Jaimini co-lord comparison only (_stronger_co_lord); not a traditional own sign (BUG-1211).
 RAHU_KETU_OWNED_SIGN_INDEX = {'Rahu': 10, 'Ketu': 7}
 # Planets that form the solar / lunar neighbour yogas (BUG-1187, BUG-1206).
 FIVE_TRUE_PLANETS = ('Mars', 'Mercury', 'Jupiter', 'Venus', 'Saturn')
@@ -200,9 +201,11 @@ class YogaContext:
         self.panchanga = self.context.get("panchanga", {}) if isinstance(self.context, dict) else {}
         self.upagraha = self.context.get("upagraha", {}) if isinstance(self.context, dict) else {}
 
-        # 预计算 D1 宫主星。v6.0.39: Scorpio/Aquarius follow PyJHora's dynamic co-lord resolver
-        # (Scorpio: stronger of Mars/Ketu; Aquarius: stronger of Saturn/Rahu), while SIGN_LORDS stays
-        # as the classical fixed fallback for dignity tables and non-Jaimini contexts.
+        # 预计算 D1 宫主星。BUG-1211 (ruling 甲12): the main detection path uses the
+        # fixed traditional lords (Scorpio -> Mars, Aquarius -> Saturn), as the lord
+        # chain, functional roles and the frontend do. The v6.0.39 PyJHora "stronger
+        # co-lord" resolver (_stronger_co_lord) is kept for Jaimini variants only and
+        # runs only when a caller asks for dynamic_co_lords=True.
         self._house_lords: Dict[int, str] = {}
         for h in range(1, 13):
             sign = SIGNS[(self.asc_idx + h - 1) % 12]
@@ -239,7 +242,13 @@ class YogaContext:
         return [SIGNS.index(s) for s in DUAL_SIGNS if SIGNS.index(s) != sign_idx]
 
     def _stronger_co_lord(self, planet1: str, planet2: str) -> str:
-        """Approximate PyJHora stronger_planet_from_planet_positions() for Sc/Aq co-lords."""
+        """Approximate PyJHora stronger_planet_from_planet_positions() for Sc/Aq co-lords.
+
+        Jaimini-variant only (BUG-1211): reached only through
+        `_resolve_sign_lord(..., dynamic_co_lords=True)`; no main-path caller.
+        RAHU_KETU_OWNED_SIGN_INDEX is this comparison's internal convention, not a
+        traditional own sign.
+        """
         h1 = self._sign_index_of_planet(planet1)
         h2 = self._sign_index_of_planet(planet2)
         if h1 is None:
@@ -314,7 +323,7 @@ class YogaContext:
             return planet1 if degree1 > degree2 else planet2
         return planet1
 
-    def _resolve_sign_lord(self, sign: str, dynamic_co_lords: bool = True) -> Optional[str]:
+    def _resolve_sign_lord(self, sign: str, dynamic_co_lords: bool = False) -> Optional[str]:
         if not dynamic_co_lords:
             return SIGN_LORDS.get(sign)
         if sign == 'Scorpio':