T9.4 - S7: one sample-data affordance, confirmed, and fenced off the project

Four affordances under three names became ONE: "Load sample data", on the
creator's toolbar, at the far end of two separators from the live actions
(New / Duplicate), pushed right with its own gap. It confirms through the
T7.9 dialog, naming exactly what it does - and what it does not: "This page
only: nothing is written to the project unless you then save." The probe
verifies the fence the way the done-when demands - against a REAL project,
reading the server's SOP and work-package list before and after and asserting
byte-identical.

Gone: the wizard's header "Load sample" (the dangerous one: it filled the
state completeSOP() pushes to the LIVE project, one click, no confirm, no
undo - reconciled with D1 exactly as the task records: the creator's control
is the survivor, the wizard copy goes), the creator's split Sample SOP /
Load example pair (now internals behind the one entry point), and the
empty-state context bar's third button (its text now points at the toolbar
control). The location/material "Load sample values" buttons stay: they fill
a PASTE BOX that acts only through an explicit, dry-runnable import - a
different thing, stated in the code.

Probes re-pointed with reasons in place: frame_check's D1 toolbar list names
the consolidated control; validation_check's sample-driven toast checks
became the-affordance-is-gone checks (and its stale showAnalytics drive,
orphaned by T7.10, became a the-duplicate-stays-gone check).

Verification (each probe run alone): NEW tests/sample_check.py 10/10.
Regressions: validation_check 77/77, frame_check 38/38, kitting_check 26/26,
export_check 20/20, sections_check 95/95.

Items: S7 (D1 reconciliation honored)

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

tests/frame_check.py

@@ -247,7 +247,9 @@ def page_checks(page, base, tok):
     # "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"):
+    # "Sample SOP" + "Load example" became the ONE "Load sample data" at T9.4
+    # (S7): D1's point was that the sample control is reachable, and it still is.
+    for label in ("Load sample data", "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)