feat: show measurements on the site

Each emulator with records gets a Tested block: claim, result, method, computer, core build and the permalink of its record at the pin. A Measurements page filters every test in the browser from the compact index, and the Data page lists measurements.sqlite with its tables. One SQLite file per emulator is linked from its page. wiki/measurements.md says how a test runs, held to the Start here budgets.

Both workflows fetch the pinned commit alone with git before the build, and the deploy fails without it.

tests/test_site_r4_reference.py

@@ -248,6 +248,13 @@ class SourceLinksOnlyWhereTheFileIs(unittest.TestCase):
     def test_every_rendered_link_is_recorded(self):
         record = json.loads(sitesources.SOURCE_PATHS.read_text(encoding="utf-8"))
         pages = sorted(_built(DOCS / "emulators").rglob("*.md*")) + sorted(DOCS.glob("gaps*.md*"))
+        import sync_measurements  # noqa: PLC0415
+
+        # A Tested block links the measurements repository at its pin. The
+        # record of source trees does not cover it: those paths are checked
+        # against the pinned tree of the clone itself.
+        measured_slug = urllib.parse.urlsplit(sync_measurements.load_pin()["repo"]).path.strip("/")
+        measured: dict[str, set[str]] = {}
         checked, stray = 0, []
         for page in pages:
             for found in _PERMALINK.finditer(page.read_text(encoding="utf-8")):
@@ -256,7 +263,17 @@ class SourceLinksOnlyWhereTheFileIs(unittest.TestCase):
                 key = f"{found['host']}/{found['slug']}@{found['pin']}"
                 path = urllib.parse.unquote(found["path"])
                 checked += 1
-                if path not in record.get(key, ()):
+                if found["slug"] == measured_slug:
+                    if found["pin"] not in measured:
+                        if not sync_measurements.has_commit(sync_measurements.CLONE, found["pin"]):
+                            stray.append((page.name, key, "pin not in the measurements clone"))
+                            measured[found["pin"]] = set()
+                            continue
+                        measured[found["pin"]] = set(
+                            sync_measurements.tree_files(sync_measurements.CLONE, found["pin"]))
+                    if path not in measured[found["pin"]]:
+                        stray.append((page.name, key, path))
+                elif path not in record.get(key, ()):
                     stray.append((page.name, key, path))
         self.assertGreater(checked, 1000)
         self.assertEqual(stray[:20], [])