test: fix v3 branding drift, add reconcile CLI + registry coverage

GUI/lang-pack tests were asserting against pre-v3 strings ("Data
Cleaning Mastery", "Maestría en limpieza…") that the brand refresh
replaced with "UNALOGIX DataTools" + "Clean. Normalize. Transform."
Updated assertions to the current copy and switched the findings
panel tests to the redesigned flat-list layout (per-finding "Open
Tool →" buttons instead of per-tool expanders).

New coverage:
- tests/test_cli_reconcile.py (13) — preview/apply, tolerance flags,
  sign inversion, key flags, error paths, Excel input.
- tests/test_tools_registry.py (27) — unique tool_ids, page_slug →
  real file, valid sections/tiers, localized accessor fallbacks,
  explicit pins for PDF Extractor + Reconciler entries.
- tests/test_reconcile.py — one-side-empty, key-pass tagging,
  additional validation cases, input-DataFrame immutability.
- tests/gui/test_smoke.py — PAGE_SLUGS now includes 10_PDF_Extractor
  and 11_Reconciler in both en/es.
- tests/gui/test_workflows.py — TestPdfExtractorWorkflow and
  TestReconcilerWorkflow render checks.

Net: 2317 passed → 2418 passed, 0 failures.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/gui/test_activation.py

@@ -85,8 +85,8 @@ class TestGatePassesWithTrialLicense:
         home_app.run()
         text = collected_text(home_app)
         # With a valid license, the activation form should NOT be the
-        # primary content; we should see the home title + tool cards.
-        assert "Data Cleaning Mastery" in text
+        # primary content; we should see the home tagline + tool cards.
+        assert "Clean. Normalize. Transform." in text
         assert "Activate DataTools" not in text  # form not shown inline
 
     def test_sidebar_shows_active_status(self, trial_license, home_app):
@@ -150,7 +150,7 @@ class TestActivationFormSubmission:
         # After activation the page reruns and the activation form
         # should be gone — we should see the home page proper.
         text = collected_text(home_app)
-        assert "Data Cleaning Mastery" in text
+        assert "Clean. Normalize. Transform." in text
 
     def test_trial_button_absent_paid_only(self, no_license_env, home_app):
         """v1.6 dropped the user-facing trial flow — paid licenses only.