feat(narayana): show the Sanjay Rath version beside the legacy one (T4, BUG-1218)

Display only; scoring and timing conclusions keep the legacy algorithm.
narayana_legacy_label attaches a Rath view (seed, deciding level, direction,
24 MDs, running MD/AD) under modules.narayana_dasha.rath for the consultation
modules, full reading Step 4.13 and the CLI. Reference report: one summary
line under the legacy line plus Rath MD / running-MD AD tables (English terms
added). Evidence card: narayana_rath (label, seed sign, level, running MD) on
timing / annual cards only — other cards sit at 11,979 of 12,000 characters.
Goldens re-captured from the real engine.

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

tests/test_narayana_legacy_label.py

@@ -61,3 +61,56 @@ def test_kn_rao_never_names_narayana_on_user_visible_surfaces() -> None:
                 ROOT / "scripts/narayana_dasha.py", ROOT / "scripts/cmd_narayana_dasha.py"]
     hits = [path.name for path in surfaces if pattern.search(path.read_text(encoding="utf-8"))]
     assert hits == []
+
+
+# ── BUG-1218 (T4): Sanjay Rath version shown beside the legacy one ──
+
+def test_full_reading_carries_the_rath_view_and_leaves_the_legacy_result_alone() -> None:
+    from scripts.jyotish_engine import cmd_full_reading
+    from scripts.narayana_dasha import narayana_dasha_full_report
+    from scripts.narayana_legacy_label import RATH_LABEL_ZH
+
+    reading = cmd_full_reading(type("Args", (), dict(CASES["day"]))())
+    module = reading["modules"]["narayana_dasha"]
+    rath = module["rath"]
+    assert rath["algorithm_label"] == RATH_LABEL_ZH and rath["used_for_scoring"] is False
+    assert rath["profile"] == "sanjay_rath" and rath["seed_sign"] and rath["strength_level_decided"] in range(1, 8)
+    assert len(rath["mahadasha"]) == 24 and len(rath["current_md_antardasha"]) == 12
+    # Attaching the Rath view leaves every legacy field exactly as it was.
+    from scripts.narayana_legacy_label import label_legacy_narayana
+    lons = {"Sun": 10.0, "Moon": 100.0, "Mars": 200.0, "Mercury": 20.0, "Jupiter": 250.0,
+            "Venus": 340.0, "Saturn": 300.0, "Rahu": 50.0, "Ketu": 230.0}  # fictional
+    base = narayana_dasha_full_report(lagna_sign_idx=3, planet_lons=lons, current_age=40.0, birth_year=1980)
+    with_rath = label_legacy_narayana(copy.deepcopy(base), lagna_sign_idx=3, planet_lons=lons, current_age=40.0, birth_year=1980)
+    without = label_legacy_narayana(copy.deepcopy(base))
+    assert "rath" not in without
+    assert {key: value for key, value in with_rath.items() if key != "rath"} == without
+
+
+def test_reference_edition_shows_both_and_english_terms_cover_the_rath_lines() -> None:
+    from scripts.narayana_legacy_label import rath_report_lines_zh
+    from scripts.pl9_reader_english_terms import PHRASES_EN, REGEX_EN
+
+    packet = _packet(CASES["day"])
+    zh = _pl9_export_markdown_for_edition(copy.deepcopy(packet), "reference")
+    legacy = zh.index(f"- 算法：{LEGACY_NOTE_ZH}")
+    rath = zh.index("- 并列：Sanjay Rath 版（并列参考，未进打分与时间轴结论）：起运宫 ")
+    assert legacy < rath
+    assert "| Rath MD | 星座 | 宫主 | 起始年龄 | 结束年龄 | 年数 |" in zh and "| Rath AD | 星座 | 起始年龄 | 结束年龄 |" in zh
+    view = packet["worksheets"]["timing_and_predictive_systems"]["narayana_dasha"]["rath"]
+    for line in rath_report_lines_zh(view):
+        text = line
+        for pattern, target in REGEX_EN:
+            text = pattern.sub(target, text)
+        for source, target in PHRASES_EN:
+            text = text.replace(source, target)
+        assert not re.search(r"[一-鿿]", text), text
+
+
+def test_consultation_modules_carry_the_rath_view() -> None:
+    golden = json.loads((ROOT / "frontend/tests/fixtures/consult-evidence-card-golden.json").read_text(encoding="utf-8"))
+    for chart in golden["charts"]:
+        for route in ("workflow", "annual_workflow", "timing_workflow"):
+            module = chart[route]["chart"]["modules"]["narayana_dasha"]
+            assert module["profile"] == LEGACY_PROFILE
+            assert module["rath"]["used_for_scoring"] is False and module["rath"]["current_dasha"]["md"]["sign"]

tests/test_narayana_rath_book_tables.py

@@ -222,8 +222,29 @@ def test_table25_sub_periods_24_of_36() -> None:
     assert (gemini["stronger_sign"], gemini["strength_level_decided"], gemini["start_sign"]) == ("Sagittarius", 5, "Cancer")
 
 
-def test_rath_profile_is_not_wired_into_any_product_path() -> None:
+def test_rath_profile_is_display_only() -> None:
+    """原值：没有任何脚本导入 narayana_rath（`users == []`）
+    新值：只有展示层 narayana_legacy_label 导入它；冻结的打分文件与 rectification/ 都不导入展示层或 Rath 模块
+    原因：BUG-1218 T4（产品负责人 2026-10-03 晚恢复 T4）：Rath 版与旧算法并列显示，打分与时间轴结论仍用旧算法"""
     pattern = re.compile(r"\bnarayana_rath\b")
     users = sorted(path.name for path in (ROOT / "scripts").rglob("*.py")
                    if path.name != "narayana_rath.py" and pattern.search(path.read_text(encoding="utf-8")))
-    assert users == []
+    assert users == ["narayana_legacy_label.py"]
+    frozen = json.loads((ROOT / "references/rectification_sealed_holdout.v1.json").read_text(encoding="utf-8"))
+    scoring = set(_production_files(frozen)) | {str(p.relative_to(ROOT)) for p in (ROOT / "scripts/rectification").rglob("*.py")}
+    display = re.compile(r"\b(narayana_rath|narayana_legacy_label)\b")
+    assert sorted(path for path in scoring if display.search((ROOT / path).read_text(encoding="utf-8"))) == []
+
+
+def _production_files(record) -> list:
+    found = []
+    if isinstance(record, dict):
+        for key, value in record.items():
+            if key == "production_scoring_files" and isinstance(value, list):
+                found.extend(value)
+            else:
+                found.extend(_production_files(value))
+    elif isinstance(record, list):
+        for value in record:
+            found.extend(_production_files(value))
+    return found