T7.10 - D5: one analytics implementation, and its report on the admin console

Usage analytics existed as five of the nine colliding globals creator-frame.md
counted (ANALYTICS_KEY, analyticsLoad, analyticsSave, downloadAnalytics,
showAnalytics), twice - and the wizard's copy had no caller, because the
button lived on the creator. The admin console had a THIRD private reader
(usageLoad/downloadUsage) that only saw the wizard's key.

Now: ONE core, html/wp-usage.js (window.WPUsage: load/save/track/download +
the two pre-move storage keys, verbatim). The creator and wizard keep only a
thin track() wrapper - page state like the creator's dev-mode pause belongs
to the page - and record exactly what they recorded before, under the same
keys, so everything captured before this task still reads (probe plants a
legacy-format event and finds it in the report). The "Usage data" button left
the creator toolbar; the report lives in admin.html's usage card, covering
BOTH tools with a download each, behind the same admin gate as the rest of
the console (a non-admin sees the denied card and nothing else), usable at
390px.

Two probes re-pointed, both with the reason in the code:
- cards_check pinned admin.js byte-identical to HEAD - right for T6.5, but as
  a standing probe it would fail every legitimate later edit; D5 targets
  admin.js by name. A7's localization is protected by the feature checks and
  the end-to-end drive, plus a wiring assertion on the block itself.
- frame_check listed "Usage data" among the toolbar buttons that must be
  visible; it now asserts the button is GONE, so the duplicate cannot quietly
  return.

Verification (each probe run alone): NEW tests/usage_check.py 15/15 (grep
half: WPUsage defined once, no page touches the keys directly, none of the
five globals survives anywhere). Regressions: cards_check ALL PASS,
frame_check 39/39.

Items: D5

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tests/frame_check.py

@@ -244,8 +244,13 @@ def page_checks(page, base, tok):
       });
       return JSON.stringify(out);
     })()"""))
-    for label in ("Sample SOP", "Load example", "View SOP", "Import SOP", "Usage data"):
+    # "Usage data" left this list at T7.10: D5 moved the report to the admin
+    # console. Its absence HERE is asserted, so the button cannot quietly return
+    # and recreate the duplicate D5 existed to remove.
+    for label in ("Sample SOP", "Load example", "View SOP", "Import SOP"):
         chk("%-13s is visible on the unframed page" % label, vis.get(label) is True, vis)
+    chk("Usage data    is GONE from the creator toolbar (D5)",
+        "Usage data" not in vis, vis)
     chk("...and every one of them has a handler that exists", page.eval("""(() => {
       return [...document.querySelectorAll('#wp-toolbar button')].every(b => {
         const m = (b.getAttribute('onclick') || '').match(/^([A-Za-z_$][\\w$]*)\\(/);