docs: sync cross repo advantage plan

tests/test_cross_repo_advantage_sync_plan.py

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+from __future__ import annotations
+
+import json
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+LEDGER = ROOT / "docs" / "research" / "cross_repo_advantage_sync_status_2026_07_19.md"
+E2E = ROOT / "references" / "cross_project_contract" / "commercial_astrology_e2e_acceptance_questions_2026_07_19.json"
+UX = ROOT / "docs" / "research" / "commercial_onboarding_ux_research_contract_2026_07_19.md"
+
+
+def test_cross_repo_advantage_ledger_tracks_both_directions_and_blockers() -> None:
+    text = LEDGER.read_text(encoding="utf-8")
+
+    assert "Research → Commercial" in text
+    assert "Commercial → Research" in text
+    assert "not credits, billing, payment, or Supabase service-role runtime" in text
+    assert "gender interpretation boundary" in text
+    assert "day-level holdout" in text
+    assert "VedAstro hosted identity" in text
+    assert "Shadbala/AV worked example" in text
+
+
+def test_commercial_e2e_acceptance_has_eight_real_user_questions() -> None:
+    data = json.loads(E2E.read_text(encoding="utf-8"))
+
+    assert data["contract_id"] == "commercial_astrology_e2e_acceptance_questions_2026_07_19"
+    assert data["status"] == "acceptance_contract_not_runtime_claim"
+    assert len(data["questions"]) == 8
+    required_layers = {layer for q in data["questions"] for layer in q["required_layers"]}
+    for layer in {
+        "Vimshottari Dasha",
+        "Narayana Dasha",
+        "D9",
+        "D10",
+        "D2",
+        "D11",
+        "UL",
+        "A10",
+        "Shadbala",
+        "Ashtakavarga",
+        "VedAstro gateway boundary",
+        "timing precision contract",
+        "gender interpretation boundary",
+    }:
+        assert layer in required_layers
+
+
+def test_commercial_onboarding_ux_contract_is_research_safe() -> None:
+    text = UX.read_text(encoding="utf-8")
+
+    assert "称呼 → 出生时间 → 出生地点 → 时间校正" in text
+    assert "资料缺失时引导补全，不把缺失说成系统错误" in text
+    assert "不迁移积分、支付、商业账户权益" in text
+    assert "research interaction prototype" in text