refactor(gui): drop Review page + normalization gate

Home is now the only entry point: the "Run analysis" button on the
upload section IS the review step (findings render inline via
render_findings_panel). Tool pages no longer gate on a passed
normalization — running the analyzer is sufficient context.

Removed:
- src/gui/pages/0_Review.py
- src/gui/components/gate.py (re-export seam)
- require_normalization_gate() in src/gui/components/_legacy.py
- "review" section enum in tools_registry.py
- Data Review entry in app.py navigation
- require_normalization_gate() calls + imports in all nine tool pages
- tests/gui/test_gate.py (whole file)
- TestReviewWorkflow in tests/gui/test_workflows.py
- 0_Review entry in tests/gui/test_smoke.py PAGE_SLUGS
- stash_upload's normalization_result+normalization_for stashing
- stash_upload_without_gate (was the gate's negative-path helper)

2017 tests pass (16 retired with the gate flow).

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

tests/gui/test_workflows.py

@@ -151,50 +151,6 @@ class TestPipelineRunnerWorkflow:
         assert "Automated Workflows" in text
 
 
-# ---------------------------------------------------------------------------
-# Review page — special: doesn't gate on upload, has its own analyzer flow
-# ---------------------------------------------------------------------------
-
-class TestReviewWorkflow:
-    """The Review page is the gate-fixer. Without an upload it shows
-    its own file uploader so the user can start the flow from this
-    page directly. With an upload it runs the analyzer and shows
-    findings."""
-
-    def test_no_upload_shows_inline_uploader(self, app_factory):
-        app = app_factory("0_Review")
-        app.run()
-        text = collected_text(app)
-        # Page should invite the user to upload, not redirect home.
-        assert "Upload" in text or "Choose a file" in text, (
-            f"Review page should expose an inline uploader; got:\n{text[:400]}"
-        )
-        # The 'Back to home' button is gone — the page is self-contained now.
-        labels = [b.label for b in app.button]
-        assert not any("Back to home" in lbl for lbl in labels), (
-            f"Back-to-home button should be removed; got buttons: {labels}"
-        )
-
-    def test_with_upload_shows_review_content(
-        self, app_factory, small_csv_bytes,
-    ):
-        app = app_factory("0_Review")
-        # Review page only needs the upload bytes, not a pre-passed gate.
-        app.session_state["home_uploaded_bytes"] = small_csv_bytes
-        app.session_state["home_uploaded_name"] = "messy.csv"
-        app.session_state["home_uploaded_size"] = len(small_csv_bytes)
-        app.run()
-        assert not app.exception
-        text = collected_text(app)
-        # Page ran the analyzer — either we get findings or the
-        # "already clean" success message. Either way confirms the
-        # analyzer pipeline ran end-to-end with the stashed bytes.
-        clean_msg = "No findings to review" in text
-        encoding_section = "File encoding" in text
-        assert clean_msg or encoding_section, (
-            f"Review page didn't surface analyzer output; got:\n{text[:400]}"
-        )
-
 
 # ---------------------------------------------------------------------------
 # Coming-Soon pages still render (just a stub) — pinned so we know if a