refactor: read measurements from the local tree

The site compiles the index and the SQLite files from measurements/
instead of a pinned clone. The pin, the sync script, the CI clone steps,
the freshness area and its refresh handler are gone. core_probe --record
writes into measurements/ of the checkout by default, and a test fails
when a line or data file HEAD holds changed or vanished.

scripts/check_freshness.py

@@ -3,7 +3,7 @@
 
 Each layer the repository transcribes moves on its own schedule: platform
 lists, hardware targets, core-info, buildbot system assets, dump catalogs,
-romset DATs, the measurements pin, the CI toolchain. This script asks each of them the same
+romset DATs, the CI toolchain. This script asks each of them the same
 question, is the local copy the one upstream serves, and answers with one
 row per subject.
 
@@ -40,7 +40,7 @@ import shutil
 import subprocess
 import sys
 import tempfile
-from collections.abc import Callable, Iterator
+from collections.abc import Iterator
 from concurrent.futures import ThreadPoolExecutor
 from dataclasses import asdict, dataclass, field
 from datetime import datetime, timezone
@@ -80,8 +80,7 @@ INSTALLERS = ("install.sh", "install.ps1")
 
 SHOWN_ITEMS = 4  # items named in a diff summary before ", ..."
 SHOWN_NAMES = 12  # core names named in an unresolved row before ", ..."
-AREAS = ("platforms", "native", "targets", "coreinfo", "data", "catalogs", "measurements", "ci",
-         "profiles")
+AREAS = ("platforms", "native", "targets", "coreinfo", "data", "catalogs", "ci", "profiles")
 OK, STALE, UNKNOWN, ERROR, SKIPPED = "OK", "STALE", "UNKNOWN", "ERROR", "SKIPPED"
 # Every status a finding may carry, in the order the summary counts them.
 STATUSES = (STALE, UNKNOWN, ERROR, SKIPPED, OK)
@@ -915,31 +914,6 @@ def _check_buildbot_system() -> Finding:
                    detail=f"{names}{more} (_data_dirs.yml)", items=every)
 
 
-# --- measurements -----------------------------------------------------------
-
-
-def check_measurements(offline: bool, head: Callable[[str], str] | None = None,
-                       pin_path: Path | None = None) -> Finding:
-    """The measurements pin against the head of the measurements repository.
-
-    A record added there reaches the site only once the pin moves to it.
-    """
-    import sync_measurements  # noqa: PLC0415
-
-    pin = sync_measurements.load_pin(pin_path or sync_measurements.PIN_FILE)
-    local = pin["commit"][:12]
-    if offline:
-        return Finding("measurements", "records pin", SKIPPED, local=local, detail="offline")
-    try:
-        remote = (head or sync_measurements.remote_head)(pin["repo"])
-    except (sync_measurements.MeasurementsError, OSError, subprocess.TimeoutExpired) as exc:
-        return Finding("measurements", "records pin", UNKNOWN, local=local, detail=str(exc))
-    if remote == pin["commit"]:
-        return Finding("measurements", "records pin", OK, local=local, remote=remote[:12])
-    return Finding("measurements", "records pin", STALE, local=local, remote=remote[:12],
-                   detail="newer records: python scripts/sync_measurements.py --fetch --bump")
-
-
 # --- catalogs and recipes ---------------------------------------------------
 
 
@@ -1532,8 +1506,6 @@ def main() -> int:
         findings.extend(check_data(args.offline))
     if "catalogs" in areas:
         findings.extend(check_catalogs(args.cache_dir, args.offline))
-    if "measurements" in areas:
-        findings.append(check_measurements(args.offline))
     if "ci" in areas:
         findings.extend(check_ci(args.cache_dir, args.offline))
     if "profiles" in areas: