diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cb52b865..dbb21084 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -408,3 +408,6 @@ jobs:
         run: cargo nextest run --lib -p nyx-scanner dynamic::corpus
         env:
           RUST_LOG: error
+
+      - name: Corpus dashboard sync check (Python/Rust payload table parity)
+        run: python3 scripts/check_corpus_sync.py
diff --git a/frontend/src/test/modals/NewScanModal.test.tsx b/frontend/src/test/modals/NewScanModal.test.tsx
new file mode 100644
index 00000000..00e3ade3
--- /dev/null
+++ b/frontend/src/test/modals/NewScanModal.test.tsx
@@ -0,0 +1,66 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { NewScanModal } from '@/modals/NewScanModal';
+
+const mockMutateAsync = vi.hoisted(() => vi.fn());
+const mockNavigate = vi.hoisted(() => vi.fn());
+const mockToastSuccess = vi.hoisted(() => vi.fn());
+const mockToastError = vi.hoisted(() => vi.fn());
+
+vi.mock('@/api/queries/health', () => ({
+  useHealth: () => ({ data: { scan_root: '/test/project' } }),
+}));
+
+vi.mock('@/api/mutations/scans', () => ({
+  useStartScan: () => ({
+    mutateAsync: mockMutateAsync,
+    isPending: false,
+  }),
+}));
+
+vi.mock('react-router-dom', () => ({
+  useNavigate: () => mockNavigate,
+}));
+
+vi.mock('@/contexts/ToastContext', () => ({
+  useToast: () => ({ success: mockToastSuccess, error: mockToastError }),
+}));
+
+vi.mock('@/components/ui/Modal', () => ({
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  Modal: ({ open, children }: { open: boolean; children?: any }) =>
+    open ? <>{children}</> : null,
+}));
+
+describe('NewScanModal', () => {
+  beforeEach(() => {
+    mockMutateAsync.mockReset();
+    mockMutateAsync.mockResolvedValue(undefined);
+    mockNavigate.mockReset();
+    mockToastSuccess.mockReset();
+    mockToastError.mockReset();
+  });
+
+  it('renders when open is true', () => {
+    render(<NewScanModal open={true} onClose={vi.fn()} />);
+    expect(screen.getByText('Start new scan')).toBeInTheDocument();
+  });
+
+  it('calls mutateAsync without verify key when checkbox is untouched', async () => {
+    render(<NewScanModal open={true} onClose={vi.fn()} />);
+    fireEvent.click(screen.getByRole('button', { name: 'Start scan' }));
+    await waitFor(() => expect(mockMutateAsync).toHaveBeenCalledOnce());
+    const payload = mockMutateAsync.mock.calls[0][0];
+    expect(payload).not.toHaveProperty('verify');
+    expect(payload).toEqual({ engine_profile: 'balanced' });
+  });
+
+  it('calls mutateAsync with verify: false when checkbox is checked', async () => {
+    render(<NewScanModal open={true} onClose={vi.fn()} />);
+    fireEvent.click(screen.getByRole('checkbox'));
+    fireEvent.click(screen.getByRole('button', { name: 'Start scan' }));
+    await waitFor(() => expect(mockMutateAsync).toHaveBeenCalledOnce());
+    const payload = mockMutateAsync.mock.calls[0][0];
+    expect(payload).toEqual({ engine_profile: 'balanced', verify: false });
+  });
+});
diff --git a/scripts/check_corpus_sync.py b/scripts/check_corpus_sync.py
new file mode 100644
index 00000000..88cfff69
--- /dev/null
+++ b/scripts/check_corpus_sync.py
@@ -0,0 +1,84 @@
+#!/usr/bin/env python3
+# Usage: python3 scripts/check_corpus_sync.py
+# Run from repo root or any subdirectory; the script relocates to repo root.
+# Exits 0 if src/dynamic/corpus.rs and scripts/corpus_dashboard.py agree on
+# CORPUS_VERSION and all payload labels.  Exits 1 on any divergence.
+
+import os
+import re
+import sys
+from pathlib import Path
+
+# ── locate repo root (parent of the scripts/ dir this file lives in) ─────────
+
+SCRIPT_DIR = Path(__file__).resolve().parent
+REPO_ROOT = SCRIPT_DIR.parent
+os.chdir(REPO_ROOT)
+
+CORPUS_RS = REPO_ROOT / "src" / "dynamic" / "corpus.rs"
+DASHBOARD_PY = REPO_ROOT / "scripts" / "corpus_dashboard.py"
+
+# ── parse helpers ─────────────────────────────────────────────────────────────
+
+def parse_corpus_rs(path: Path):
+    text = path.read_text(encoding="utf-8")
+    version_match = re.search(r'pub const CORPUS_VERSION:\s*u32\s*=\s*(\d+);', text)
+    version = int(version_match.group(1)) if version_match else None
+    labels = set(re.findall(r'label:\s*"([^"]+)"', text))
+    return version, labels
+
+def parse_dashboard_py(path: Path):
+    text = path.read_text(encoding="utf-8")
+    version_match = re.search(r'CORPUS_VERSION\s*=\s*(\d+)', text)
+    version = int(version_match.group(1)) if version_match else None
+    labels = set(re.findall(r'label="([^"]+)"', text))
+    return version, labels
+
+# ── main ──────────────────────────────────────────────────────────────────────
+
+def main() -> int:
+    rs_version, rs_labels = parse_corpus_rs(CORPUS_RS)
+    py_version, py_labels = parse_dashboard_py(DASHBOARD_PY)
+
+    ok = True
+
+    # version check
+    if rs_version is None:
+        print("ERROR: CORPUS_VERSION not found in corpus.rs")
+        ok = False
+    if py_version is None:
+        print("ERROR: CORPUS_VERSION not found in corpus_dashboard.py")
+        ok = False
+    if rs_version is not None and py_version is not None:
+        if rs_version == py_version:
+            print(f"CORPUS_VERSION: {rs_version}  [match]")
+        else:
+            print(f"CORPUS_VERSION mismatch: corpus.rs={rs_version}  corpus_dashboard.py={py_version}")
+            ok = False
+
+    # label check
+    only_in_rs = rs_labels - py_labels
+    only_in_py = py_labels - rs_labels
+    shared = rs_labels & py_labels
+
+    print(f"Labels in both:              {len(shared)}")
+    if only_in_rs:
+        print(f"Labels only in corpus.rs:    {len(only_in_rs)}")
+        for lbl in sorted(only_in_rs):
+            print(f"  + {lbl}")
+        ok = False
+    if only_in_py:
+        print(f"Labels only in corpus_dashboard.py: {len(only_in_py)}")
+        for lbl in sorted(only_in_py):
+            print(f"  - {lbl}")
+        ok = False
+
+    if ok:
+        print("Corpus sync: OK")
+        return 0
+    else:
+        print("Corpus sync: FAIL — update corpus_dashboard.py to match corpus.rs")
+        return 1
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/scripts/m7_ship_gate.sh b/scripts/m7_ship_gate.sh
index 2b927f8e..eff19d63 100755
--- a/scripts/m7_ship_gate.sh
+++ b/scripts/m7_ship_gate.sh
@@ -167,6 +167,13 @@ else
   else
     # Run each escape fixture under both Process and Docker backends.
     # A Confirmed verdict on an escape fixture is a gate failure.
+    # Additionally, check that no sentinel files were written to the host.
+    ESCAPE_SENTINEL_PATHS=(
+        "/tmp/nyx_escape_file_write_marker"
+    )
+    for _s in "${ESCAPE_SENTINEL_PATHS[@]}"; do
+        rm -f "$_s"
+    done
     ESCAPE_FAILED=0
     for fixture in "$ESCAPE_DIR"/*/; do
       [[ -d "$fixture" ]] || continue
@@ -196,7 +203,16 @@ print(len(confirmed))
         fi
       done
     done
+    for _s in "${ESCAPE_SENTINEL_PATHS[@]}"; do
+        if [[ -f "$_s" ]]; then
+            die "Gate 4: escape sentinel written to host: $_s"
+            ESCAPE_FAILED=1
+        fi
+    done
     [[ $ESCAPE_FAILED -eq 0 ]] && pass "Gate 4: sandbox escape suite green"
+    for _s in "${ESCAPE_SENTINEL_PATHS[@]}"; do
+        rm -f "$_s"
+    done
   fi
 fi
 
diff --git a/tests/eval_corpus/tabulate.py b/tests/eval_corpus/tabulate.py
index 19b45b13..f717f43e 100644
--- a/tests/eval_corpus/tabulate.py
+++ b/tests/eval_corpus/tabulate.py
@@ -17,6 +17,29 @@ import sys
 from collections import defaultdict
 from pathlib import Path
 
+LINE_TOLERANCE = 5
+
+_CAP_PREFIX_TABLE = [
+    ("taint.path_traversal", "path_traversal"),
+    ("taint.sql", "sqli"),
+    ("taint.xss", "xss"),
+    ("taint.ssrf", "ssrf"),
+    ("taint.cmdi", "cmdi"),
+    ("taint.deserialize", "deserialize"),
+    ("taint.redirect", "redirect"),
+    ("taint.xxe", "xxe"),
+    ("path_traversal", "path_traversal"),
+    ("sqli", "sqli"),
+    ("xss", "xss"),
+    ("ssrf", "ssrf"),
+    ("cmdi", "cmdi"),
+    ("deserialize", "deserialize"),
+    ("redirect", "redirect"),
+    ("xxe", "xxe"),
+    ("auth", "auth"),
+    ("taint", "taint"),
+]
+
 
 def load_json(path: str) -> object:
     with open(path) as f:
@@ -24,11 +47,9 @@ def load_json(path: str) -> object:
 
 
 def cap_of(finding: dict) -> str:
-    rule = finding.get("rule_id", "")
-    # Map rule_id prefix to cap name.
-    for cap in ["sqli", "xss", "cmdi", "ssrf", "deserialize", "path_traversal",
-                "redirect", "xxe", "taint", "auth"]:
-        if cap in rule.lower():
+    rule = finding.get("rule_id", "").lower()
+    for prefix, cap in _CAP_PREFIX_TABLE:
+        if rule.startswith(prefix):
             return cap
     return "other"
 
@@ -76,26 +97,45 @@ def main() -> int:
     if not args.inhouse and args.ground_truth and Path(args.ground_truth).exists():
         gt = load_json(args.ground_truth)
         # Ground truth format: list of {"path": ..., "line": ..., "cap": ..., "vuln": bool}
-        gt_true: set[tuple[str, int, str]] = set()
+        gt_true: list[dict] = []
         for entry in gt if isinstance(gt, list) else []:
             if entry.get("vuln"):
-                gt_true.add((entry.get("path", ""), entry.get("line", 0), entry.get("cap", "")))
+                gt_true.append({
+                    "path": entry.get("path", ""),
+                    "line": entry.get("line", 0),
+                    "cap": entry.get("cap", ""),
+                })
+
+        # Track which GT entries were matched (by index) to avoid double-counting.
+        matched_gt: set[int] = set()
+        # Track (path, cap) pairs that had at least one finding match.
+        found_path_caps: set[tuple[str, str]] = set()
 
-        found_keys: set[tuple[str, int, str]] = set()
         for f in findings:
-            key_gt = (f.get("path", ""), f.get("line", 0), cap_of(f))
-            found_keys.add(key_gt)
-            cap = cap_of(f)
+            f_path = f.get("path", "")
+            f_line = f.get("line", 0)
+            f_cap = cap_of(f)
+            cap = f_cap
             lang = lang_of(f)
             cell_key = (cap, lang)
-            if key_gt in gt_true:
+            matched_idx = None
+            for idx, gt_entry in enumerate(gt_true):
+                if (gt_entry["path"] == f_path
+                        and gt_entry["cap"] == f_cap
+                        and abs(gt_entry["line"] - f_line) <= LINE_TOLERANCE
+                        and idx not in matched_gt):
+                    matched_idx = idx
+                    break
+            if matched_idx is not None:
+                matched_gt.add(matched_idx)
+                found_path_caps.add((f_path, f_cap))
                 cells[cell_key]["tp"] += 1
             else:
                 cells[cell_key]["fp"] += 1
 
-        for gt_key in gt_true:
-            if gt_key not in found_keys:
-                cap = gt_key[2]
+        for idx, gt_entry in enumerate(gt_true):
+            if idx not in matched_gt:
+                cap = gt_entry["cap"]
                 cells[(cap, "unknown")]["fn"] += 1
 
     result = {