migration: prove standalone maintenance and correct visual evidence

config/architecture-inventory.json

@@ -254,7 +254,7 @@
   "code_hotspots": [
     {
       "path": "frontend/styles/styles.css",
-      "bytes": 361780,
+      "bytes": 361776,
       "lines": 15465
     },
     {
@@ -279,12 +279,12 @@
     },
     {
       "path": "frontend/app.js",
-      "bytes": 91151,
+      "bytes": 89213,
       "lines": 1939
     },
     {
       "path": "frontend/pages/heaven/page.js",
-      "bytes": 88322,
+      "bytes": 86493,
       "lines": 1830
     },
     {
@@ -299,7 +299,7 @@
     },
     {
       "path": "backend/features/heaven/service.py",
-      "bytes": 64421,
+      "bytes": 63123,
       "lines": 1303
     },
     {
@@ -309,7 +309,7 @@
     },
     {
       "path": "frontend/pages/market/runtime.js",
-      "bytes": 57053,
+      "bytes": 55720,
       "lines": 1333
     },
     {
@@ -319,7 +319,7 @@
     },
     {
       "path": "backend/application.py",
-      "bytes": 50934,
+      "bytes": 49784,
       "lines": 1165
     },
     {
@@ -329,7 +329,7 @@
     },
     {
       "path": "database.py",
-      "bytes": 34013,
+      "bytes": 33284,
       "lines": 746
     }
   ]

tests/preservation_helpers.py

@@ -26,6 +26,7 @@ RETIRED_FRONTEND_SOURCE_RANGES = (
     (9022, 9027),
     (9052, 9055),
 )
+AUDITED_FRONTEND_SOURCE_LINE_COUNT = 9283
 
 
 def sha256(path: Path) -> str:
@@ -51,12 +52,10 @@ def reassembled_frontend_runtime() -> str:
         assembled.append(content)
         next_line = end + 1
 
-    original_line_count = len(
+    if next_line != AUDITED_FRONTEND_SOURCE_LINE_COUNT + 1:
-        (ORIGINAL_STATIC / "app.js").read_text(encoding="utf-8").splitlines()
-    )
-    if next_line != original_line_count + 1:
         raise AssertionError(
-            f"app.js source coverage ended at {next_line - 1}, expected {original_line_count}"
+            "app.js source coverage ended at "
+            f"{next_line - 1}, expected {AUDITED_FRONTEND_SOURCE_LINE_COUNT}"
         )
     return "".join(assembled)
 

tests/test_frontend_boundaries.py

@@ -4,6 +4,7 @@ import json
 import re
 import unittest
 from pathlib import Path
+from unittest.mock import patch
 
 from tests.preservation_helpers import reassembled_frontend_runtime
 
@@ -46,6 +47,14 @@ class FrontendBoundaryTests(unittest.TestCase):
         self.assertIn("const state = window.XiaobaiState.create({", app)
         self.assertNotIn("const state = {", app)
 
+    def test_candidate_runtime_reassembly_does_not_require_original_static(self) -> None:
+        with patch(
+            "tests.preservation_helpers.ORIGINAL_STATIC",
+            ROOT / "missing-original-static",
+        ):
+            app = reassembled_frontend_runtime()
+        self.assertIn("function openView(", app)
+
     def test_runtime_page_registry_matches_governance_registry(self) -> None:
         expected = json.loads(
             (ROOT / "config" / "pages.config.json").read_text(encoding="utf-8")

tests/test_maintenance_tools.py

@@ -3,11 +3,16 @@ from __future__ import annotations
 import json
 import subprocess
 import sys
+import tempfile
 import unittest
 from pathlib import Path
 
 from tools.build_api_registry import build as build_api_registry
-from tools.build_architecture_inventory import build as build_architecture_inventory
+from tools.build_architecture_inventory import (
+    build as build_architecture_inventory,
+    source_metrics,
+)
+from tools.verify_baseline import python_test_command
 
 
 ROOT = Path(__file__).resolve().parents[1]
@@ -34,6 +39,22 @@ class MaintenanceToolTests(unittest.TestCase):
         self.assertIn("stop_e2e_server(server)", source)
         self.assertNotIn('"static/app.js"', source)
 
+    def test_standalone_verifier_excludes_only_migration_comparison_modules(self) -> None:
+        repository_command = python_test_command(preservation_baseline=True)
+        standalone_command = python_test_command(preservation_baseline=False)
+        self.assertIn("discover", repository_command)
+        self.assertTrue(any(item == "tests.test_frontend_contract" for item in standalone_command))
+        self.assertFalse(any("test_preservation_" in item for item in standalone_command))
+
+    def test_architecture_metrics_are_independent_of_checkout_line_endings(self) -> None:
+        with tempfile.TemporaryDirectory() as directory:
+            root = Path(directory)
+            lf = root / "lf.js"
+            crlf = root / "crlf.js"
+            lf.write_bytes(b"const a = 1;\nconst b = 2;\n")
+            crlf.write_bytes(b"const a = 1;\r\nconst b = 2;\r\n")
+            self.assertEqual(source_metrics(lf), source_metrics(crlf))
+
     def test_every_tool_has_a_non_mutating_help_path(self) -> None:
         for path in sorted((ROOT / "tools").glob("*.py")):
             if path.name.startswith("_"):

tools/README.md

@@ -14,6 +14,13 @@ maintenance command cannot be mistaken for a historical migration rewrite.
 - `python tools/build_architecture_inventory.py [--check]`: generate or verify
   `config/architecture-inventory.json` from the candidate source tree.
 
+Inside the canonical `webapp/app/` checkout, `verify_baseline.py` runs the full preservation
+suite against the retained original baseline and enforces `git diff --check`. In a standalone
+`app/` export where that baseline and Git checkout do not exist, the same command runs all
+candidate-owned tests, skips only `test_preservation_*` comparison modules, and reports the Git
+check as skipped. Product, registry, JavaScript, database, and optional Playwright checks remain
+active in both modes.
+
 ## Acceptance and differential checks
 
 - `run_preservation_runtime.py`: start an isolated original or candidate runtime with an

tools/build_architecture_inventory.py

@@ -75,6 +75,14 @@ def css_layers(html: str) -> list[str]:
     return re.findall(r'<link[^>]+rel="stylesheet"[^>]+href="([^"]+)"', html)
 
 
+def source_metrics(path: Path) -> dict[str, int]:
+    text = path.read_text(encoding="utf-8")
+    return {
+        "bytes": len(text.encode("utf-8")),
+        "lines": len(text.splitlines()),
+    }
+
+
 def code_hotspots() -> list[dict[str, Any]]:
     candidates = [
         "backend/application.py",
@@ -99,13 +107,7 @@ def code_hotspots() -> list[dict[str, Any]]:
         path = ROOT / name
         if not path.is_file():
             continue
-        rows.append(
+        rows.append({"path": name, **source_metrics(path)})
-            {
-                "path": name,
-                "bytes": path.stat().st_size,
-                "lines": len(path.read_text(encoding="utf-8").splitlines()),
-            }
-        )
     return sorted(rows, key=lambda item: item["bytes"], reverse=True)
 
 

tools/verify_baseline.py

@@ -21,6 +21,39 @@ def run(label: str, command: list[str]) -> None:
     subprocess.run(command, cwd=ROOT, check=True)
 
 
+def python_test_command(preservation_baseline: bool | None = None) -> list[str]:
+    if preservation_baseline is None:
+        preservation_baseline = (ROOT.parent / "static" / "app.js").is_file()
+    if preservation_baseline:
+        return [sys.executable, "-m", "unittest", "discover", "-s", "tests"]
+    modules = [
+        f"tests.{path.stem}"
+        for path in sorted((ROOT / "tests").glob("test_*.py"))
+        if not path.stem.startswith("test_preservation_")
+    ]
+    if not modules:
+        raise RuntimeError("no standalone candidate tests found")
+    return [sys.executable, "-m", "unittest", *modules]
+
+
+def verify_git_diff() -> None:
+    result = subprocess.run(
+        ["git", "rev-parse", "--show-toplevel"],
+        cwd=ROOT,
+        capture_output=True,
+        text=True,
+        check=False,
+    )
+    if result.returncode != 0:
+        print("\n[patch] skipped: standalone export is not a Git checkout")
+        return
+    repository_root = Path(result.stdout.strip()).resolve()
+    if ROOT != repository_root / "app":
+        print("\n[patch] skipped: standalone export is outside the canonical app path")
+        return
+    run("patch", ["git", "diff", "--check"])
+
+
 def verify_database() -> None:
     database = ROOT / "data" / "review.db"
     if not database.exists():
@@ -97,7 +130,7 @@ def main() -> int:
     )
     args = parser.parse_args()
 
-    run("python", [sys.executable, "-m", "unittest", "discover", "-s", "tests"])
+    run("python", python_test_command())
     run(
         "api-registry",
         [sys.executable, "tools/build_api_registry.py", "--check"],
@@ -117,7 +150,7 @@ def main() -> int:
             "javascript",
             [node, "--check", script.relative_to(ROOT).as_posix()],
         )
-    run("patch", ["git", "diff", "--check"])
+    verify_git_diff()
     verify_database()
 
     if args.e2e: