fix(avastha): mark Shayanadi blocked when there is no sunrise instead of dropping the table

Polar day or night left determine_daytime without a sunrise, so the whole
avasthas module failed after the PVR activity formula was wired in. Only
the Shayanadi cell is blocked now; the other four states still compute
(BUG-1390).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HwMNZEzdzmrbPhuRNmZe3C

scripts/avastha_calculator.py

@@ -227,7 +227,16 @@ class AvasthaCalculator:
         result["avasthas"]["Shayanadi"] = self._calculate_shayanadi_avastha(planet, sign)
         for name in ('Deeptadi', 'Lajjitadi', 'Shayanadi'):
             result['avasthas'][name]['method_status'] = 'simplified_heuristic'
-        if activity_context is not None:
+        if activity_context is not None and activity_context.get('unavailable_reason'):
+            # 极昼极夜等算不出日出时，PVR 公式缺一项。不退回元素启发式冒充，标成无法计算（BUG-1390）。
+            result['avasthas']['Shayanadi'] = {
+                'state': None,
+                'sign': sign,
+                'meaning': '当天没有可用的日出（极昼或极夜），姿态无法按 PVR 公式计算。',
+                'method_status': 'blocked',
+                'blocked_reason': activity_context['unavailable_reason'],
+            }
+        elif activity_context is not None:
             result['avasthas']['Shayanadi'] = calculate_pvr_shayanadi(
                 planet,
                 SIGNS.index(sign) * 30 + degree,
@@ -540,7 +549,7 @@ class AvasthaCalculator:
         
         # Shayanadi Avastha
         shayanadi = avasthas["Shayanadi"]
-        interpretation += f"5. 行为模式：{shayanadi['state']}（{shayanadi['sign']}）\n"
+        interpretation += f"5. 行为模式：{shayanadi['state'] or '无法计算'}（{shayanadi['sign']}）\n"
         interpretation += f"   {shayanadi['meaning']}\n"
         
         return interpretation

scripts/jyotish_engine.py

@@ -16369,15 +16369,20 @@ def cmd_full_reading(args):
     # ── Step 10.5: Avasthas 行星状态 (v4.4.0) ──
     try:
         from avastha_calculator import AvasthaCalculator
-        from saham_daynight import determine_daytime
-        avastha_solar_day = determine_daytime(
-            _birth_datetime_from_args(args), lat=args.lat, lon=args.lon, tz=args.tz, rising='hindu')
-        hours_since_sunrise = (avastha_solar_day['julian_day_ut'] - avastha_solar_day['sunrise_jd_ut']) * 24
-        avastha_activity_context = {
-            'moon_longitude': planet_lons['Moon'],
-            'asc_longitude': asc_deg,
-            'hours_since_sunrise': hours_since_sunrise,
-        }
+        from saham_daynight import SahamDayNightError, determine_daytime
+        try:
+            avastha_solar_day = determine_daytime(
+                _birth_datetime_from_args(args), lat=args.lat, lon=args.lon, tz=args.tz, rising='hindu')
+        except SahamDayNightError as exc:
+            # 极昼极夜没有日出：只让姿态一项标无法计算，其余四类照常（BUG-1390）。
+            avastha_activity_context = {'unavailable_reason': str(exc)}
+        else:
+            hours_since_sunrise = (avastha_solar_day['julian_day_ut'] - avastha_solar_day['sunrise_jd_ut']) * 24
+            avastha_activity_context = {
+                'moon_longitude': planet_lons['Moon'],
+                'asc_longitude': asc_deg,
+                'hours_since_sunrise': hours_since_sunrise,
+            }
         avast_calc = AvasthaCalculator()
         avast_result = {}
         for pn, pd in planets.items():