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>

src/gui/components/__init__.py

@@ -11,14 +11,13 @@ they need without dragging the entire kitchen-sink module:
     components/
         __init__.py        ← compatibility shim (this file)
         _legacy.py         ← original components.py, unchanged
-        gate.py            ← gate-only seam (require_normalization_gate)
         findings.py        ← analyzer-finding rendering seam
         dedup_review.py    ← dedup match-group cards + review pipeline
         shared.py          ← chrome / file-pickup helpers used by every tool
 
 A standalone Find Duplicates build, for example, can ship without
-``findings.py`` and ``gate.py`` — those modules import the analyzer /
-gate code that the Lite SKU does not include.
+``findings.py`` — that module imports the analyzer code that the
+Lite SKU does not include.
 
 Adding new tooling: drop new helpers into the appropriate seam module.
 Add their names to its ``__all__`` and to this file's ``__all__`` if
@@ -46,11 +45,10 @@ from .activation import (  # noqa: F401  re-exported
 )
 
 __all__ = [
-    # Shared chrome / pickup / gate
+    # Shared chrome / pickup
     "hide_streamlit_chrome",
     "quit_button",
     "pickup_or_upload",
-    "require_normalization_gate",
     # License gate + activation form
     "render_activation_form",
     "render_license_status_sidebar",

src/gui/components/_legacy.py

@@ -1264,45 +1264,6 @@ class _StashedUpload:
         return self._data
 
 
-def require_normalization_gate() -> None:
-    """Block the calling tool page until the upload has passed the gate.
-
-    Tool pages should call this immediately after their imports. When the
-    current session upload has not been normalized — no
-    ``normalization_result``, the result is for a different upload, or the
-    result didn't pass — the user is shown a banner and a button to jump
-    to the Review page; the rest of the page is short-circuited via
-    ``st.stop()``.
-
-    Pages that genuinely don't need a clean dataframe (rare) can opt out
-    by simply not calling this.
-    """
-    import hashlib
-    has_upload = st.session_state.get("home_uploaded_bytes") is not None
-    if not has_upload:
-        # No upload yet — let the page's own uploader handle it; the gate
-        # will kick in once a file is present.
-        return
-
-    upload_hash = hashlib.sha256(
-        st.session_state["home_uploaded_bytes"]
-    ).hexdigest()
-    result = st.session_state.get("normalization_result")
-    matched = (
-        result is not None
-        and st.session_state.get("normalization_for") == upload_hash
-        and getattr(result, "passed", False)
-    )
-    if matched:
-        return
-
-    name = st.session_state.get("home_uploaded_name") or _t("gate.default_name")
-    st.warning(_t("gate.warning", name=name))
-    if st.button(_t("gate.open_review"), type="primary"):
-        st.switch_page("pages/0_Review.py")
-    st.stop()
-
-
 def pickup_or_upload(
     *,
     label: str,

src/gui/components/gate.py

@@ -1,16 +0,0 @@
-"""Normalization-gate guard for tool pages.
-
-``require_normalization_gate`` short-circuits a tool page when the
-current upload has not yet passed the gate, redirecting the user to the
-Review & Normalize page. Pulled into its own seam module so:
-
-* A build that includes the gate (Pro / Suite SKUs) imports this.
-* A standalone single-tool build that bypasses the gate can omit this
-  module entirely without removing the helper from a shared file.
-"""
-
-from __future__ import annotations
-
-from ._legacy import require_normalization_gate
-
-__all__ = ["require_normalization_gate"]