fix(special-lagnas): compute eight birth points without PyJHora

Production images do not install PyJHora, so those eight points were blocked.
Swiss Ephemeris now computes them in-process. Rectification keeps the old
Hora and Ghati formulas.

BUG-1273.

scripts/research/freeze_special_lagnas_pyjhora_fixture.py

@@ -0,0 +1,108 @@
+#!/usr/bin/env python3
+"""Freeze PyJHora 4.8.7 special-lagna longitudes. Offline only.
+
+Run from the repo root, with a Python that has PyJHora 4.8.7 installed:
+
+    python scripts/research/freeze_special_lagnas_pyjhora_fixture.py
+
+The runtime calculator does not import this module. Tests read the JSON.
+"""
+
+from __future__ import annotations
+
+import importlib.metadata
+import io
+import json
+import sys
+from contextlib import redirect_stdout
+from datetime import datetime
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[2]
+sys.path[:0] = [str(ROOT), str(ROOT / "scripts")]
+
+import swisseph as swe  # noqa: E402
+from jhora.horoscope.chart import charts  # noqa: E402
+from jhora.panchanga import drik  # noqa: E402
+from jhora.panchanga.drik import Place  # noqa: E402
+
+OUT = ROOT / "tests" / "fixtures" / "special_lagnas_pyjhora_487.json"
+CASES = {
+    "steve_jobs_1955_aa": {
+        "source": "references/public_oracle_cases.json id steve_jobs_1955_aa",
+        "birth": dict(year=1955, month=2, day=24, hour=19, minute=15, second=0, lat=37.7749, lon=-122.4194, tz=-8),
+    },
+    "barack_obama_1961_aa": {
+        "source": "references/public_oracle_cases.json id barack_obama_1961_aa",
+        "birth": dict(year=1961, month=8, day=4, hour=19, minute=24, second=0, lat=21.3069, lon=-157.8583, tz=-10),
+    },
+    "fictional_reader_main": {
+        "source": "tests/test_report_reader_main.py FICTIONAL",
+        "birth": dict(year=1991, month=4, day=7, hour=9, minute=15, second=0, lat=30.5728, lon=104.0668, tz=8.0),
+    },
+}
+MODES = {"lahiri": "LAHIRI", "raman": "RAMAN"}
+FUNCS = (
+    ("Bhava_Lagna", "bhava_lagna"),
+    ("Hora_Lagna", "hora_lagna"),
+    ("Ghati_Lagna", "ghati_lagna"),
+    ("ViGhati_Lagna", "vighati_lagna"),
+    ("Sree_Lagna", "sree_lagna"),
+    ("Indu_Lagna", "indu_lagna"),
+    ("Pranapada_Lagna", "pranapada_lagna"),
+)
+SIGNS = [
+    "Aries", "Taurus", "Gemini", "Cancer", "Leo", "Virgo",
+    "Libra", "Scorpio", "Sagittarius", "Capricorn", "Aquarius", "Pisces",
+]
+
+
+def _point(raw) -> dict:
+    sign = int(raw[0]) % 12
+    degree = float(raw[1]) % 30.0
+    return {
+        "sign": SIGNS[sign],
+        "sign_index": sign,
+        "sign_degree": degree,
+        "longitude": sign * 30.0 + degree,
+    }
+
+
+def _case(birth: dict, mode: str) -> dict:
+    local_hour = birth["hour"] + birth["minute"] / 60.0 + birth["second"] / 3600.0
+    with redirect_stdout(io.StringIO()):
+        drik.set_ayanamsa_mode(mode)
+        jd = swe.julday(birth["year"], birth["month"], birth["day"], local_hour)
+        place = Place("birth_place", birth["lat"], birth["lon"], birth["tz"])
+        points = {key: _point(getattr(drik, name)(jd, place)) for key, name in FUNCS}
+        raw = charts.varnada_lagna(
+            (birth["year"], birth["month"], birth["day"]),
+            (birth["hour"], birth["minute"], birth["second"]),
+            place,
+            varnada_method=1,
+        )
+        points["Varnada_Lagna"] = _point(raw)
+    return points
+
+
+def main() -> None:
+    version = importlib.metadata.version("PyJHora")
+    payload = {
+        "pyjhora_version": version,
+        "generator": "python scripts/research/freeze_special_lagnas_pyjhora_fixture.py",
+        "generated_on": datetime.now().strftime("%Y-%m-%d"),
+        "cases": {},
+    }
+    for case_id, spec in CASES.items():
+        payload["cases"][case_id] = {
+            "source": spec["source"],
+            "birth": spec["birth"],
+            "ayanamsa": {name: _case(spec["birth"], mode) for name, mode in MODES.items()},
+        }
+    OUT.parent.mkdir(parents=True, exist_ok=True)
+    OUT.write_text(json.dumps(payload, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")
+    print(OUT)
+
+
+if __name__ == "__main__":
+    main()