Add WP43 frontend architecture decision tests

tests/test_frontend_architecture_decision.py

@@ -0,0 +1,93 @@
+from __future__ import annotations
+
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[1]
+DECISION = REPO_ROOT / "FRONTEND_ARCHITECTURE_DECISION.md"
+
+
+def _text() -> str:
+    return DECISION.read_text(encoding="utf-8")
+
+
+def test_wp43_keeps_streamlit_for_mvp_and_rejects_frontend_migration_now():
+    text = _text().lower()
+
+    assert "keep streamlit as the mvp validation surface for now" in text
+    assert "do not migrate to a separate frontend yet" in text
+    assert "do not build a professional document editor yet" in text
+    assert "stay with streamlit for mvp validation" in text
+
+
+def test_wp43_requires_thin_ui_and_helper_first_architecture():
+    text = _text().lower()
+
+    assert "thin ui patch layer" in text
+    assert "reusable python helper modules" in text
+    assert "contract tests before ui integration" in text
+    assert "helper/model and tests before ui integration" in text
+    assert "the ui should stay thin" in text
+
+
+def test_wp43_blocks_unapproved_professional_document_editor_features():
+    text = _text().lower()
+
+    for required in [
+        "a broad professional document editor",
+        "click-to-mark sensitive text as an authoritative workflow",
+        "complex synchronized multi-pane editing",
+        "word/pdf layout rendering",
+        "long-document virtualized review",
+        "export blocking based on ui-only state",
+        "direct scrub key mutation from new panels",
+        "replacing the current review table without a separate migration plan",
+    ]:
+        assert required in text
+
+
+def test_wp43_sets_frontend_reconsideration_criteria():
+    text = _text().lower()
+
+    assert "when to reconsider a separate frontend" in text
+    assert "document-centric review needs interaction beyond static/read-only aids" in text
+    assert "users validate the need" in text
+    assert "mvp logic is stable enough" in text
+    assert "profiles, batch review or enterprise deployment" in text
+
+
+def test_wp43_preserves_privacy_and_local_first_boundaries():
+    text = _text().lower()
+
+    for required in [
+        "python core remains source of truth",
+        "api boundary is local-first",
+        "no cloud document processing",
+        "no hidden telemetry",
+        "review/export/scrub key actions stay explicit and auditable",
+        "no real-data fixtures",
+    ]:
+        assert required in text
+
+
+def test_wp43_does_not_close_wp42d_verification_or_change_ui():
+    text = _text().lower()
+
+    assert "wp43 does not validate or close wp42d" in text
+    assert "wp42d remains pending" in text
+    for required in [
+        "does not change:",
+        "presidio_streamlit.py",
+        "fix_streamlit_nested_expanders.py",
+        "any streamlit patch file",
+        "review table behavior",
+        "export/download behavior",
+        "scrub key behavior",
+        "reinsert behavior",
+        "helper runtime behavior",
+        "dependencies",
+        "docker/runtime behavior",
+        "cloud processing",
+        "real-data fixtures",
+    ]:
+        assert required in text