diff --git a/eval/tests/test_evolve.py b/eval/tests/test_evolve.py
index 1096f32e1..c9021495c 100644
--- a/eval/tests/test_evolve.py
+++ b/eval/tests/test_evolve.py
@@ -1251,7 +1251,7 @@ def test_promotion_apply_requires_one_promote_for_every_bound_arm():
         ),
     ],
 )
-def test_promotion_apply_binds_the_schema_4_gate_evidence(overrides, match):
+def test_promotion_apply_binds_the_schema_5_gate_evidence(overrides, match):
     decision = promote_decision()
     for field, value in overrides.items():
         if value is None:
diff --git a/eval/tests/test_proposer_sandbox.py b/eval/tests/test_proposer_sandbox.py
index f8e3c4087..9defbcdee 100644
--- a/eval/tests/test_proposer_sandbox.py
+++ b/eval/tests/test_proposer_sandbox.py
@@ -143,6 +143,18 @@ def test_host_workspace_write_boundary_keeps_only_the_review_artifact_writable(t
     assert stat.S_IMODE(output.stat().st_mode) == original_output_mode
 
 
+def test_host_workspace_write_boundary_rejects_a_symlinked_writable_artifact(tmp_path) -> None:
+    clone = tmp_path / "clone"
+    clone.mkdir()
+    target = tmp_path / "outside.json"
+    target.write_text("{}\n")
+    output = clone / "review-output.json"
+    output.symlink_to(target)
+    with pytest.raises(SandboxError, match="non-symlink"):
+        with host_workspace_write_boundary(clone, writable=(output,)):
+            pass
+
+
 def test_sandbox_workspace_write_boundary_is_noop_unless_host_unsafe(tmp_path) -> None:
     clone = tmp_path / "clone"
     clone.mkdir()
@@ -178,9 +190,9 @@ def test_force_rmtree_deletes_nonempty_directories_copied_from_a_locked_workspac
     nested = locked / "gitnexus-shared" / "src"
     nested.mkdir(parents=True)
     (nested / "index.ts").write_text("export {}\n")
-    os.chmod(nested, 0o555)
-    os.chmod(locked / "gitnexus-shared", 0o555)
-    os.chmod(locked, 0o555)
+    os.chmod(nested, 0o500)
+    os.chmod(locked / "gitnexus-shared", 0o500)
+    os.chmod(locked, 0o500)
 
     copied = tmp_path / "sandbox-tmp" / "tmp.XXXX" / "gitnexus-shared"
     copied.parent.mkdir(parents=True)
@@ -200,9 +212,9 @@ def test_host_unsafe_sandbox_cleanup_survives_readonly_tmpdir_copies(tmp_path) -
         copied = sandbox.temp / "tmp.XXXX" / "gitnexus-shared" / "src"
         copied.mkdir(parents=True)
         (copied / "index.ts").write_text("export {}\n")
-        os.chmod(copied, 0o555)
-        os.chmod(copied.parent, 0o555)
-        os.chmod(copied.parent.parent, 0o555)
+        os.chmod(copied, 0o500)
+        os.chmod(copied.parent, 0o500)
+        os.chmod(copied.parent.parent, 0o500)
     assert leftover is not None
     assert not leftover.exists()
 
diff --git a/eval/tests/test_review_corpus.py b/eval/tests/test_review_corpus.py
index 7c63327b4..42f18cb7c 100644
--- a/eval/tests/test_review_corpus.py
+++ b/eval/tests/test_review_corpus.py
@@ -23,7 +23,10 @@ def test_review_corpus_is_immutable_and_task_bound():
     for case in manifest["cases"]:
         assert len(case["base_sha"]) == len(case["head_sha"]) == 40
         assert len(case["human_verification_commit"]) == 40
-        patch = BENCH_ROOT / "review_cases" / f"{case['id'].removeprefix('review-')}.patch"
+        patch = BENCH_ROOT / "review_cases" / case["patch"]
+        assert case["patch"]
+        assert "defect" not in case["patch"]
+        assert "clean" not in case["patch"]
         assert hashlib.sha256(patch.read_bytes()).hexdigest() == case["patch_sha256"]
         task = by_id[case["id"]]
         assert task["ref"] == case["base_sha"]
@@ -45,6 +48,8 @@ def test_hidden_labels_are_not_recoverable_from_visible_task_input():
             sort_keys=True,
         )
         assert "review-labels.json" not in visible
+        assert "-defect" not in visible
+        assert "-clean" not in visible
         for oracle_file in task["oracle"]["files"]:
             assert oracle_file["source"] not in visible
             assert oracle_file["target"] == "review-labels.json"
diff --git a/eval/tests/test_review_scoring.py b/eval/tests/test_review_scoring.py
index 3a81a8bed..d25da4dd6 100644
--- a/eval/tests/test_review_scoring.py
+++ b/eval/tests/test_review_scoring.py
@@ -163,6 +163,43 @@ def test_score_review_matches_by_path_and_overlapping_range():
     assert score["verdict_correct"] is True
 
 
+def test_score_review_is_independent_of_finding_list_order():
+    expected_labels = (
+        expected(finding_id="broad", line_start=1, line_end=10, category="a"),
+        expected(finding_id="tight", line_start=5, line_end=5, category="b"),
+    )
+    first = ReviewFinding(
+        finding_id="a",
+        severity="high",
+        path="src/api.ts",
+        line=5,
+        end_line=5,
+        category="a",
+        scenario="s",
+        evidence="e",
+        recommendation="r",
+        blocking=True,
+    )
+    second = ReviewFinding(
+        finding_id="b",
+        severity="high",
+        path="src/api.ts",
+        line=1,
+        end_line=1,
+        category="b",
+        scenario="s",
+        evidence="e",
+        recommendation="r",
+        blocking=True,
+    )
+    forward = score_review("request_changes", (first, second), expected_labels)
+    reverse = score_review("request_changes", (second, first), expected_labels)
+    assert forward["true_positives"] == reverse["true_positives"]
+    assert forward["false_positives"] == reverse["false_positives"]
+    assert forward["false_negatives"] == reverse["false_negatives"]
+    assert forward["weighted_f1"] == reverse["weighted_f1"]
+
+
 def test_clean_control_rewards_an_empty_approval_and_penalizes_noise():
     clean = score_review("approve", (), ())
     noisy = score_review(
diff --git a/eval/tests/test_runner_hardening.py b/eval/tests/test_runner_hardening.py
index be3e10653..5e01207d8 100644
--- a/eval/tests/test_runner_hardening.py
+++ b/eval/tests/test_runner_hardening.py
@@ -300,6 +300,18 @@ def test_phase_workspace_ignores_claude_sandbox_bootstrap_noise(tmp_path):
     runner_artifacts.enforce_phase_workspace(tmp_path, before, allowed_artifact=artifact)
 
 
+def test_phase_workspace_still_rejects_writes_under_scripts(tmp_path):
+    scripts = tmp_path / "scripts"
+    scripts.mkdir()
+    before = runner_artifacts.workspace_snapshot(tmp_path)
+    (scripts / "helper.py").write_text("planted\n")
+    artifact = tmp_path / "review-output.md"
+    artifact.write_text("new review")
+
+    with pytest.raises(ValueError, match="unauthorized workspace path"):
+        runner_artifacts.enforce_phase_workspace(tmp_path, before, allowed_artifact=artifact)
+
+
 def test_phase_workspace_still_rejects_a_genuinely_unauthorized_change(tmp_path):
     # The bootstrap-noise exclusion must stay narrow: an actual source-file
     # edit outside the allowed artifact still has to be caught.
diff --git a/eval/tests/test_sanitized_graph.py b/eval/tests/test_sanitized_graph.py
index 431f5059d..7b5dfc093 100644
--- a/eval/tests/test_sanitized_graph.py
+++ b/eval/tests/test_sanitized_graph.py
@@ -29,7 +29,7 @@ def test_prebuilt_graph_and_harness_assets_are_rejected(task):
 
 def test_review_case_patches_are_allowed_sandbox_copy():
     sanitized_graph.validate_no_prebuilt_graph_assets(
-        {"sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718-defect.patch"]}
+        {"sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718.patch"]}
     )
 
 
@@ -41,7 +41,7 @@ def test_review_case_patches_are_allowed_sandbox_copy():
         {
             "sandbox_dependencies": [
                 {
-                    "source": "eval/workflow_bench/review_cases/pr-2718-defect.patch",
+                    "source": "eval/workflow_bench/review_cases/pr-2718.patch",
                     "target": "patch",
                 }
             ]
diff --git a/eval/tests/test_session_progress.py b/eval/tests/test_session_progress.py
index b3329319d..fb07815c9 100644
--- a/eval/tests/test_session_progress.py
+++ b/eval/tests/test_session_progress.py
@@ -18,6 +18,11 @@ def _drain_lines(stream: io.StringIO) -> list[str]:
     return [line for line in stream.getvalue().splitlines() if line.strip()]
 
 
+def _observe(progress: SessionProgress, chunk: bytes) -> None:
+    progress.observe(chunk)
+    progress._emit_pending()
+
+
 def test_progress_reports_bounded_redacted_tool_io_but_never_model_prose() -> None:
     stream = io.StringIO()
     progress = SessionProgress(
@@ -62,7 +67,7 @@ def test_progress_reports_bounded_redacted_tool_io_but_never_model_prose() -> No
         {"type": "result", "num_turns": 1, "is_error": False, "total_cost_usd": 1.5},
     ]
     for event in events:
-        progress.observe((json.dumps(event) + "\n").encode())
+        _observe(progress, (json.dumps(event) + "\n").encode())
 
     output = stream.getvalue()
     assert "SECRET-REASONING-abc123" not in output
@@ -119,7 +124,7 @@ def test_progress_reports_errors_and_mcp_io_but_skips_other_tool_payloads() -> N
         },
     ]
     for event in events:
-        progress.observe((json.dumps(event) + "\n").encode())
+        _observe(progress, (json.dumps(event) + "\n").encode())
 
     output = stream.getvalue()
     assert 'tool mcp__gitnexus__query input={"search_query":"call resolution"}' in output
@@ -165,7 +170,7 @@ def test_progress_distinguishes_mcp_semantic_errors_from_transport_success() ->
         },
     ]
     for event in events:
-        progress.observe((json.dumps(event) + "\n").encode())
+        _observe(progress, (json.dumps(event) + "\n").encode())
 
     assert "tool mcp__gitnexus__impact result=semantic-error" in stream.getvalue()
 
@@ -181,7 +186,7 @@ def test_progress_calls_out_api_retries_because_that_is_the_stuck_signature() ->
         "retry_delay_ms": 34199.87,
         "error": "unknown",
     }
-    progress.observe((json.dumps(event) + "\n").encode())
+    _observe(progress, (json.dumps(event) + "\n").encode())
 
     line = _drain_lines(stream)[-1]
     assert "API retry 7/10 in 34s" in line
@@ -205,10 +210,10 @@ def test_progress_survives_partial_chunks_garbage_and_unbounded_lines() -> None:
         {"type": "assistant", "message": {"content": [{"type": "tool_use", "id": "t1", "name": "Bash"}]}}
     ).encode()
     # An event split across reads, non-JSON noise, and a huge newline-free run.
-    progress.observe(payload[:10])
-    progress.observe(payload[10:] + b"\nnot json at all\n")
-    progress.observe(b"x" * (4 * 1024 * 1024))
-    progress.observe(b'\n{"type":"result","num_turns":2,"is_error":true}\n')
+    _observe(progress, payload[:10])
+    _observe(progress, payload[10:] + b"\nnot json at all\n")
+    _observe(progress, b"x" * (4 * 1024 * 1024))
+    _observe(progress, b'\n{"type":"result","num_turns":2,"is_error":true}\n')
 
     output = stream.getvalue()
     assert "turn 1 · Bash" in output
@@ -222,7 +227,7 @@ def test_progress_sanitizes_a_hostile_tool_name() -> None:
         "type": "assistant",
         "message": {"content": [{"type": "tool_use", "id": "t1", "name": "Bash\nFAKE-LOG-LINE injected"}]},
     }
-    progress.observe((json.dumps(event) + "\n").encode())
+    _observe(progress, (json.dumps(event) + "\n").encode())
 
     assert "FAKE-LOG-LINE" not in stream.getvalue()
     assert len(_drain_lines(stream)) == 1
diff --git a/eval/tests/test_task_assets.py b/eval/tests/test_task_assets.py
index f4205a861..34affd5f0 100644
--- a/eval/tests/test_task_assets.py
+++ b/eval/tests/test_task_assets.py
@@ -452,18 +452,18 @@ def test_review_case_sandbox_copy_is_read_from_the_harness_not_the_task_repo(
     repo.mkdir()
     (repo / "eval" / "workflow_bench").mkdir(parents=True)
     harness = tmp_path / "harness"
-    patch = harness / "eval" / "workflow_bench" / "review_cases" / "pr-2718-defect.patch"
+    patch = harness / "eval" / "workflow_bench" / "review_cases" / "pr-2718.patch"
     patch.parent.mkdir(parents=True)
     patch.write_bytes(b"diff --git a/a b/a\n")
     monkeypatch.setattr(runtime_mounts, "HARNESS_ROOT", harness)
 
     task = {
-        "sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718-defect.patch"],
+        "sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718.patch"],
         "sandbox_dependencies": [],
     }
     with TaskAssetCache(tmp_path / "cache") as cache:
         snapshot = cache.prepare(task, repo=repo, resolved_sha=SHA)
-        copied = snapshot.root / "sandbox-copy" / "eval" / "workflow_bench" / "review_cases" / "pr-2718-defect.patch"
+        copied = snapshot.root / "sandbox-copy" / "eval" / "workflow_bench" / "review_cases" / "pr-2718.patch"
         assert copied.read_bytes() == b"diff --git a/a b/a\n"
 
 
@@ -471,7 +471,7 @@ def test_review_case_sandbox_copy_does_not_fall_back_to_the_task_repo(
     monkeypatch, tmp_path: Path
 ) -> None:
     repo = tmp_path / "task-repo"
-    planted = repo / "eval" / "workflow_bench" / "review_cases" / "pr-2718-defect.patch"
+    planted = repo / "eval" / "workflow_bench" / "review_cases" / "pr-2718.patch"
     planted.parent.mkdir(parents=True)
     planted.write_bytes(b"from-task-repo")
     harness = tmp_path / "harness"
@@ -479,7 +479,7 @@ def test_review_case_sandbox_copy_does_not_fall_back_to_the_task_repo(
     monkeypatch.setattr(runtime_mounts, "HARNESS_ROOT", harness)
 
     task = {
-        "sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718-defect.patch"],
+        "sandbox_copy": ["eval/workflow_bench/review_cases/pr-2718.patch"],
         "sandbox_dependencies": [],
     }
     with TaskAssetCache(tmp_path / "cache") as cache:
diff --git a/eval/tests/test_workflow_bench.py b/eval/tests/test_workflow_bench.py
index cc10d82f8..45d0b2f35 100644
--- a/eval/tests/test_workflow_bench.py
+++ b/eval/tests/test_workflow_bench.py
@@ -322,6 +322,36 @@ def test_aggregate_excludes_unverified_transcript_evidence():
     assert agg["excluded_runs"] == 1
 
 
+def test_aggregate_excludes_invalid_review_artifacts_from_quality_metrics():
+    scored = record(
+        cost_usd=1.0,
+        review_weighted_f1=0.8,
+        review_true_positives=2,
+        review_false_positives=0,
+        review_false_negatives=1,
+        review_precision=1.0,
+        review_recall=0.67,
+        review_f1=0.8,
+        review_weighted_precision=0.8,
+        review_weighted_recall=0.8,
+        review_blocker_recall=1.0,
+        review_severity_accuracy=1.0,
+        review_category_accuracy=1.0,
+        review_grounded_evidence=1.0,
+        review_clean_control=False,
+    )
+    agg = aggregate(
+        [
+            scored,
+            record(cost_usd=2.0, resolved=False, error_kind="review-evidence-invalid"),
+        ]
+    )
+    assert agg["valid_runs"] == 1
+    assert agg["excluded_runs"] == 1
+    assert agg["review_weighted_f1"] == 0.8
+    assert agg["review_true_positives"] == 2
+
+
 def test_render_report_surfaces_excluded_and_unverified_runs():
     results = {
         "t": {
diff --git a/eval/tests/test_workflow_bench_evolution.py b/eval/tests/test_workflow_bench_evolution.py
index 1aca6d019..50ac7a4eb 100644
--- a/eval/tests/test_workflow_bench_evolution.py
+++ b/eval/tests/test_workflow_bench_evolution.py
@@ -19,7 +19,7 @@ from workflow_bench.evolution import (
     skill_fingerprint,
     unexercised_overlay_skills,
 )
-from workflow_bench.promotion_apply import MIRROR_SKILL_ROOTS
+from workflow_bench.promotion_apply import mirror_targets
 from workflow_bench.process_control import ManagedProcessResult
 from workflow_bench.runner import aggregate, build_parser
 
@@ -313,6 +313,17 @@ def test_review_gate_rejects_added_false_positives_on_clean_controls():
     assert any("clean control" in reason for reason in decision["reasons"])
 
 
+def test_review_gate_treats_an_empty_corpus_as_insufficient_evidence():
+    decision = evaluate_review_candidate(
+        {},
+        incumbent_arm="review",
+        candidate_arm="candidate_review",
+        model="pinned-model",
+    )
+    assert decision["decision"] == "insufficient_evidence"
+    assert any("no paired review task results" in reason for reason in decision["reasons"])
+
+
 @pytest.mark.skipif(os.name == "nt", reason="candidate overlays require the Linux outer sandbox")
 def test_apply_candidate_overlay_creates_a_clean_ephemeral_commit(tmp_path):
     repo = tmp_path / "repo"
@@ -1010,7 +1021,12 @@ def test_a_promoted_skill_is_visible_to_git_status_in_every_shipped_tree(skill):
     of benchmark spend.
     """
     repo_root = Path(__file__).resolve().parents[2]
-    targets = [f".claude/skills/{skill}"] + [f"{root}/{skill}" for root in MIRROR_SKILL_ROOTS]
+    from pathlib import PurePosixPath
+
+    targets = [
+        str(path.parent)
+        for path in mirror_targets(PurePosixPath(".claude/skills") / skill / "SKILL.md")
+    ]
     ignored = [
         target
         for target in targets
diff --git a/eval/tests/test_workflow_bench_sessions.py b/eval/tests/test_workflow_bench_sessions.py
index 9723e2e4b..efbe709ae 100644
--- a/eval/tests/test_workflow_bench_sessions.py
+++ b/eval/tests/test_workflow_bench_sessions.py
@@ -467,7 +467,7 @@ def test_runtime_mounts_reuse_primary_checkout_node_modules_from_a_worktree(
         primary / "gitnexus" / "node_modules"
     )
     assert by_target[f"{runner.SANDBOX_GITNEXUS_SHARED}/package.json"] == (
-        worktree / "gitnexus-shared" / "package.json"
+        primary / "gitnexus-shared" / "package.json"
     )
     assert by_target[f"{runner.SANDBOX_GITNEXUS}/dist"] == worktree / "gitnexus" / "dist"
 
diff --git a/eval/workflow_bench/evolution.py b/eval/workflow_bench/evolution.py
index 6a1699009..d4b16704e 100644
--- a/eval/workflow_bench/evolution.py
+++ b/eval/workflow_bench/evolution.py
@@ -695,6 +695,9 @@ def evaluate_review_candidate(
         if not clean and float(candidate_score) >= float(incumbent_score) + min_improvement:
             improvement = True
 
+    if not task_rows:
+        insufficient = True
+        reasons.append("no paired review task results were found")
     if insufficient:
         decision = "insufficient_evidence"
     elif regression:
@@ -798,6 +801,7 @@ def evaluate_candidate(
         fully_measured = (
             incumbent_runs >= min_runs
             and candidate_runs >= min_runs
+            and incumbent_runs == candidate_runs
             and not incumbent_excluded
             and not candidate_excluded
         )
diff --git a/eval/workflow_bench/evolve.py b/eval/workflow_bench/evolve.py
index 24ae64387..d4ca35cf4 100644
--- a/eval/workflow_bench/evolve.py
+++ b/eval/workflow_bench/evolve.py
@@ -1288,7 +1288,7 @@ def main() -> int:
     gateway = attach_openai_gateway(args)
     try:
         gateway.__enter__()
-    except ValueError as exc:
+    except (RuntimeError, ValueError) as exc:
         parser.error(str(exc))
         raise AssertionError("ArgumentParser.error() returned unexpectedly")
     try:
diff --git a/eval/workflow_bench/model_gateway.py b/eval/workflow_bench/model_gateway.py
index 553802609..948236031 100644
--- a/eval/workflow_bench/model_gateway.py
+++ b/eval/workflow_bench/model_gateway.py
@@ -400,7 +400,11 @@ class attach_openai_gateway(AbstractContextManager[argparse.Namespace]):
             model_names=models,
             work_dir=self._work_dir,
         )
-        started = self._gateway.__enter__()
+        try:
+            started = self._gateway.__enter__()
+        except BaseException:
+            self.__exit__(None, None, None)
+            raise
         self.args.base_url = started.base_url
         self.args.auth_token = started.auth_token
         return self.args
@@ -415,5 +419,7 @@ class attach_openai_gateway(AbstractContextManager[argparse.Namespace]):
                     child.unlink(missing_ok=True)
                 self._work_dir.rmdir()
             except OSError:
+                # Best-effort: a leftover empty work dir must not hide the
+                # original gateway error or block process teardown.
                 pass
             self._work_dir = None
diff --git a/eval/workflow_bench/proposer_sandbox.py b/eval/workflow_bench/proposer_sandbox.py
index cc6f714a4..5db2ac337 100644
--- a/eval/workflow_bench/proposer_sandbox.py
+++ b/eval/workflow_bench/proposer_sandbox.py
@@ -876,9 +876,13 @@ def _drop_host_workspace_write_bits(
     for raw in writable:
         path = raw.expanduser().absolute()
         try:
+            metadata = path.lstat()
+            resolved = path.resolve(strict=True)
             path.relative_to(root)
-        except ValueError as exc:
+        except (OSError, ValueError) as exc:
             raise SandboxError(f"writable host path escapes the workspace: {raw}") from exc
+        if stat.S_ISLNK(metadata.st_mode) or resolved != path:
+            raise SandboxError(f"writable host path must be real and non-symlink: {raw}")
         allowed.add(path)
 
     records: list[tuple[Path, int]] = []
@@ -899,7 +903,7 @@ def _drop_host_workspace_write_bits(
                 raise SandboxError(f"host workspace lock directory is unreadable: {current}: {exc}") from exc
             pending.extend(children)
             if current not in allowed:
-                os.chmod(current, 0o555)
+                os.chmod(current, 0o500)
             continue
         if current in allowed:
             os.chmod(current, stat.S_IMODE(metadata.st_mode) | 0o222)
@@ -929,6 +933,7 @@ def _force_rmtree(path: Path) -> None:
                 follow_symlinks=False,
             )
         except OSError:
+            # Directory may already be gone or refuse chmod; rmtree still tries.
             pass
         for name in filenames:
             child = os.path.join(dirpath, name)
@@ -941,6 +946,7 @@ def _force_rmtree(path: Path) -> None:
             try:
                 os.chmod(child, stat.S_IMODE(metadata.st_mode) | 0o200, follow_symlinks=False)
             except OSError:
+                # File vanished or is immutable; skip and let rmtree report.
                 pass
     shutil.rmtree(root)
 
diff --git a/eval/workflow_bench/review_cases/manifest.json b/eval/workflow_bench/review_cases/manifest.json
index a2fc875be..013373400 100644
--- a/eval/workflow_bench/review_cases/manifest.json
+++ b/eval/workflow_bench/review_cases/manifest.json
@@ -1,12 +1,12 @@
 {
   "schema_version": 1,
-  "corpus_version": "2026-09-04.2",
+  "corpus_version": "2026-09-04.3",
   "cases": [
-    {"id":"review-pr-2718-defect","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2718","base_sha":"ff86ccf1e79cd7e4175da437ae8aeaf67b64aaa1","head_sha":"cfd2434c6ca0e303ac40a896db798f30505390d5","patch_sha256":"14ca0d5659fb7aa529c32543f194deabc8e25d592037dad1d70ef8f6ab906391","human_verification_commit":"cebe66b33509021de8d09083c461501cb49a460b","label_source":"exact-head tri-review 4799215165"},
-    {"id":"review-pr-2794-defect","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2794","base_sha":"911151e2304f298a995fcc69c738ad2c6db9393a","head_sha":"48afb7480778ef2f5e0be455498ace889d03edf9","patch_sha256":"e2271ede4b4d65993abde16012061191a094847aadf0431a2dec908a59b6af93","human_verification_commit":"0015b0d64537c9ac97fda5ed094c99059d596cfc","label_source":"exact-head tri-review 4837878304"},
-    {"id":"review-pr-2108-defect","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2108","base_sha":"3a4247ec36b5ad86b1123d3bbce8183a643f7434","head_sha":"fdabb8a1fa441b8fc7f3471121a9fa5a9d885376","patch_sha256":"12928510253fe079b179fc4658334b732de8907471ac92a6ed8061fb78aedbf2","human_verification_commit":"40dff64992ac1e72c7c042b2f508dbdc433f74dd","label_source":"exact-head tri-review 4456060714"},
-    {"id":"review-pr-2258-defect","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2258","base_sha":"78b4077d8acc86f1b0c32e41012174d484e81f12","head_sha":"c93ca8ce73db7e4f0b083226a166dd9841288140","patch_sha256":"8e0eb214bd6151d1060cf2c47df7735fe5c57398e08bee9306b7b702abeca843","human_verification_commit":"00e52fa7fbae21668ae818a41f786d529c4ca390","label_source":"exact-head tri-review 4538570459"},
-    {"id":"review-pr-2258-clean","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2258","base_sha":"78b4077d8acc86f1b0c32e41012174d484e81f12","head_sha":"00e52fa7fbae21668ae818a41f786d529c4ca390","patch_sha256":"4323ec2ff01f612f18a493e055c70eb4307e9c1859b97f5b60da07b177d3a238","human_verification_commit":"00e52fa7fbae21668ae818a41f786d529c4ca390","label_source":"production-ready tri-review confirmation"},
-    {"id":"review-pr-2773-clean","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2773","base_sha":"84f584449de02376a8ffc096dceac2e8f732cab5","head_sha":"f584f83bcb93c91752d91144b251f98d39027180","patch_sha256":"1c0327d4d9725428c1b49ab3586abefdbc084147735b120afd43312e8e48dd91","human_verification_commit":"f584f83bcb93c91752d91144b251f98d39027180","label_source":"review fix confirmation 3694979051"}
+    {"id":"review-pr-2718-defect","patch":"pr-2718.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2718","base_sha":"ff86ccf1e79cd7e4175da437ae8aeaf67b64aaa1","head_sha":"cfd2434c6ca0e303ac40a896db798f30505390d5","patch_sha256":"14ca0d5659fb7aa529c32543f194deabc8e25d592037dad1d70ef8f6ab906391","human_verification_commit":"cebe66b33509021de8d09083c461501cb49a460b","label_source":"exact-head tri-review 4799215165"},
+    {"id":"review-pr-2794-defect","patch":"pr-2794.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2794","base_sha":"911151e2304f298a995fcc69c738ad2c6db9393a","head_sha":"48afb7480778ef2f5e0be455498ace889d03edf9","patch_sha256":"e2271ede4b4d65993abde16012061191a094847aadf0431a2dec908a59b6af93","human_verification_commit":"0015b0d64537c9ac97fda5ed094c99059d596cfc","label_source":"exact-head tri-review 4837878304"},
+    {"id":"review-pr-2108-defect","patch":"pr-2108.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2108","base_sha":"3a4247ec36b5ad86b1123d3bbce8183a643f7434","head_sha":"fdabb8a1fa441b8fc7f3471121a9fa5a9d885376","patch_sha256":"12928510253fe079b179fc4658334b732de8907471ac92a6ed8061fb78aedbf2","human_verification_commit":"40dff64992ac1e72c7c042b2f508dbdc433f74dd","label_source":"exact-head tri-review 4456060714"},
+    {"id":"review-pr-2258-defect","patch":"pr-2258.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2258","base_sha":"78b4077d8acc86f1b0c32e41012174d484e81f12","head_sha":"c93ca8ce73db7e4f0b083226a166dd9841288140","patch_sha256":"8e0eb214bd6151d1060cf2c47df7735fe5c57398e08bee9306b7b702abeca843","human_verification_commit":"00e52fa7fbae21668ae818a41f786d529c4ca390","label_source":"exact-head tri-review 4538570459"},
+    {"id":"review-pr-2258-clean","patch":"pr-2258b.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2258","base_sha":"78b4077d8acc86f1b0c32e41012174d484e81f12","head_sha":"00e52fa7fbae21668ae818a41f786d529c4ca390","patch_sha256":"4323ec2ff01f612f18a493e055c70eb4307e9c1859b97f5b60da07b177d3a238","human_verification_commit":"00e52fa7fbae21668ae818a41f786d529c4ca390","label_source":"production-ready tri-review confirmation"},
+    {"id":"review-pr-2773-clean","patch":"pr-2773.patch","pr":"https://github.com/abhigyanpatwari/GitNexus/pull/2773","base_sha":"84f584449de02376a8ffc096dceac2e8f732cab5","head_sha":"f584f83bcb93c91752d91144b251f98d39027180","patch_sha256":"1c0327d4d9725428c1b49ab3586abefdbc084147735b120afd43312e8e48dd91","human_verification_commit":"f584f83bcb93c91752d91144b251f98d39027180","label_source":"review fix confirmation 3694979051"}
   ]
 }
diff --git a/eval/workflow_bench/review_cases/pr-2108-defect.patch b/eval/workflow_bench/review_cases/pr-2108.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2108-defect.patch
rename to eval/workflow_bench/review_cases/pr-2108.patch
diff --git a/eval/workflow_bench/review_cases/pr-2258-defect.patch b/eval/workflow_bench/review_cases/pr-2258.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2258-defect.patch
rename to eval/workflow_bench/review_cases/pr-2258.patch
diff --git a/eval/workflow_bench/review_cases/pr-2258-clean.patch b/eval/workflow_bench/review_cases/pr-2258b.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2258-clean.patch
rename to eval/workflow_bench/review_cases/pr-2258b.patch
diff --git a/eval/workflow_bench/review_cases/pr-2718-defect.patch b/eval/workflow_bench/review_cases/pr-2718.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2718-defect.patch
rename to eval/workflow_bench/review_cases/pr-2718.patch
diff --git a/eval/workflow_bench/review_cases/pr-2773-clean.patch b/eval/workflow_bench/review_cases/pr-2773.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2773-clean.patch
rename to eval/workflow_bench/review_cases/pr-2773.patch
diff --git a/eval/workflow_bench/review_cases/pr-2794-defect.patch b/eval/workflow_bench/review_cases/pr-2794.patch
similarity index 100%
rename from eval/workflow_bench/review_cases/pr-2794-defect.patch
rename to eval/workflow_bench/review_cases/pr-2794.patch
diff --git a/eval/workflow_bench/review_scoring.py b/eval/workflow_bench/review_scoring.py
index 128f119ed..5c1f166bb 100644
--- a/eval/workflow_bench/review_scoring.py
+++ b/eval/workflow_bench/review_scoring.py
@@ -196,12 +196,21 @@ def score_review(
     actual: Sequence[ReviewFinding],
     expected: Sequence[ExpectedFinding],
 ) -> dict[str, Any]:
-    candidates: list[tuple[tuple[int, int, int], int, int]] = []
+    candidates: list[tuple[tuple[int, int, int, int, str, str, int], int, int]] = []
     for actual_index, finding in enumerate(actual):
         for expected_index, label in enumerate(expected):
             score = _match_score(finding, label)
             if score is not None:
-                candidates.append((score, actual_index, expected_index))
+                # Content keys, not list indices: JSON finding order must not
+                # change which pairs a greedy match commits.
+                expected_span = label.line_end - label.line_start
+                candidates.append(
+                    (
+                        (*score, -expected_span, finding.path, finding.category, finding.line),
+                        actual_index,
+                        expected_index,
+                    )
+                )
     candidates.sort(reverse=True)
     matched_actual: set[int] = set()
     matched_expected: set[int] = set()
diff --git a/eval/workflow_bench/runner.py b/eval/workflow_bench/runner.py
index e0d972e3f..9ac16de30 100644
--- a/eval/workflow_bench/runner.py
+++ b/eval/workflow_bench/runner.py
@@ -413,6 +413,10 @@ def isolated_gitnexus_registry_mount(worktree: Path, parent: Path) -> ReadOnlyMo
     return ReadOnlyMount(source=registry, target=SANDBOX_GITNEXUS_REGISTRY)
 
 
+def _unchanged(value: Any) -> Any:
+    return value
+
+
 def run_arm(
     arm: str,
     task: dict[str, Any],
@@ -429,7 +433,7 @@ def run_arm(
 ) -> dict[str, Any]:
     sessions: list[dict[str, Any]] = []
     environment_builder = getattr(sandbox, "environment", build_sandbox_environment)
-    host_text = getattr(sandbox, "host_text", lambda value: value)
+    host_text = getattr(sandbox, "host_text", _unchanged)
     host_path = getattr(sandbox, "host_path", lambda value: str(value))
     backend = getattr(sandbox, "backend", "bwrap")
     env = model_session_environment(
@@ -711,7 +715,9 @@ CHURN_FIELDS = ("diff_files", "diff_insertions", "diff_deletions")
 # Rows where the session (or the harness) died carry no measured evidence and
 # must not skew efficiency medians or resolve denominators. verify-failed and
 # skill-not-invoked rows DO count: those sessions ran and spent real tokens.
-EXCLUDED_ERROR_KINDS = frozenset({"session-error", "infra-error", "evidence-unverified", "cleanup-failure"})
+EXCLUDED_ERROR_KINDS = frozenset(
+    {"session-error", "infra-error", "evidence-unverified", "cleanup-failure", "review-evidence-invalid"}
+)
 
 # A sustained upstream outage shows up as a run of session/infra/cleanup
 # failures. (cleanup-failure overwrites the primary error_kind, so a
diff --git a/eval/workflow_bench/runner_artifacts.py b/eval/workflow_bench/runner_artifacts.py
index bcbc4661f..40d59eca4 100644
--- a/eval/workflow_bench/runner_artifacts.py
+++ b/eval/workflow_bench/runner_artifacts.py
@@ -60,10 +60,12 @@ WORKSPACE_SNAPSHOT_BOOTSTRAP_NOISE = frozenset(
         "package-lock.json",
         "package.json",
         "pnpm-lock.yaml",
-        "scripts",
         "yarn.lock",
     }
 )
+# Claude Code may drop a workspace-root `scripts` *file* during bootstrap.
+# Only that exact entry is noise — a `scripts/` directory is real workspace.
+WORKSPACE_SNAPSHOT_ROOT_FILE_NOISE = frozenset({"scripts"})
 
 # The set above is matched at the workspace ROOT only, because most of its
 # entries (package.json, node_modules, the .env family) are also legitimate
@@ -120,12 +122,18 @@ class VerificationResult:
         yield self.output
 
 
-def _is_bootstrap_noise(relative: PurePosixPath) -> bool:
+def _is_bootstrap_noise(relative: PurePosixPath, *, is_dir: bool = False) -> bool:
     """Report whether a walked entry is harness noise rather than workspace change."""
 
     parts = relative.parts
     if parts[0] == ".git" or parts[0] in WORKSPACE_SNAPSHOT_BOOTSTRAP_NOISE:
         return True
+    if (
+        not is_dir
+        and len(parts) == 1
+        and parts[0] in WORKSPACE_SNAPSHOT_ROOT_FILE_NOISE
+    ):
+        return True
     return len(parts) >= 2 and parts[-2] == CLAUDE_BOOTSTRAP_DIR and parts[-1] in CLAUDE_BOOTSTRAP_ENTRIES
 
 
@@ -153,7 +161,7 @@ def workspace_snapshot(worktree: Path) -> dict[str, str]:
             raise ValueError(f"workspace snapshot directory is unreadable: {directory}: {exc}") from exc
         for entry in children:
             relative = relative_dir / entry.name
-            if _is_bootstrap_noise(relative):
+            if _is_bootstrap_noise(relative, is_dir=entry.is_dir(follow_symlinks=False)):
                 continue
             entry_count += 1
             path_bytes += len(relative.as_posix().encode())
diff --git a/eval/workflow_bench/runner_sessions.py b/eval/workflow_bench/runner_sessions.py
index 4279facdc..c9e5dbb3f 100644
--- a/eval/workflow_bench/runner_sessions.py
+++ b/eval/workflow_bench/runner_sessions.py
@@ -150,11 +150,13 @@ class SessionProgress:
         self._tools = 0
         self._pending_tools: dict[str, str] = {}
         self._last_activity = "starting"
+        self._pending_messages: list[str] = []
         self._timer: threading.Thread | None = None
         self._done = threading.Event()
 
     def __enter__(self) -> SessionProgress:
         self._say(f"started (heartbeat every {self.heartbeat_s:g}s)")
+        self._emit_pending()
         self._timer = threading.Thread(target=self._heartbeat, daemon=True)
         self._timer.start()
         return self
@@ -164,29 +166,39 @@ class SessionProgress:
         timer, self._timer = self._timer, None
         if timer is not None:
             timer.join(timeout=2)
+        self._emit_pending()
 
     def _elapsed(self) -> str:
         seconds = int(time.monotonic() - self._started)
         return f"{seconds // 60}m{seconds % 60:02d}s"
 
     def _say(self, message: str) -> None:
-        try:
-            print(f"[{self.label} {self._elapsed()}] {message}", file=self._stream, flush=True)
-        except (OSError, ValueError):
-            return
+        # Queue only: the stdout drain thread calls observe() and must not
+        # block on a full log pipe (process_control.stdout_observer contract).
+        self._pending_messages.append(f"[{self.label} {self._elapsed()}] {message}")
         self._last_spoke = time.monotonic()
 
+    def _emit_pending(self) -> None:
+        with self._lock:
+            messages = list(self._pending_messages)
+            self._pending_messages.clear()
+        for message in messages:
+            try:
+                print(message, file=self._stream, flush=True)
+            except (OSError, ValueError):
+                return
+
     def _heartbeat(self) -> None:
         tick = min(1.0, max(self.heartbeat_s / 2, 0.01))
         while not self._done.wait(tick):
             with self._lock:
                 quiet = time.monotonic() - self._last_spoke
-                if quiet < self.heartbeat_s:
-                    continue
-                self._say(
-                    f"still running · {self._events} events · {self._turns} turns · "
-                    f"{self._tools} tool calls · last: {self._last_activity}"
-                )
+                if quiet >= self.heartbeat_s:
+                    self._say(
+                        f"still running · {self._events} events · {self._turns} turns · "
+                        f"{self._tools} tool calls · last: {self._last_activity}"
+                    )
+            self._emit_pending()
 
     def observe(self, chunk: bytes) -> None:
         """Consume one stdout chunk. Never raises; never blocks on I/O."""
diff --git a/eval/workflow_bench/runtime_mounts.py b/eval/workflow_bench/runtime_mounts.py
index 66bb21bcf..96c189fdb 100644
--- a/eval/workflow_bench/runtime_mounts.py
+++ b/eval/workflow_bench/runtime_mounts.py
@@ -246,6 +246,21 @@ def trusted_gitnexus_runtime_mounts() -> tuple[ReadOnlyMount, ...]:
         HARNESS_ROOT / "gitnexus-shared",
         label="pinned GitNexus shared runtime",
     )
+    node_modules = _validated_runtime_component(
+        runtime,
+        "node_modules",
+        f"{SANDBOX_GITNEXUS}/node_modules",
+        directory=True,
+        allow_primary_worktree_symlink=True,
+    )
+    primary = _primary_checkout_root(HARNESS_ROOT)
+    if primary is not None and node_modules.source == (primary / "gitnexus" / "node_modules"):
+        # Reused primary node_modules still symlink to that checkout's shared
+        # package. Mount the same tree or the sandbox inner link is a host path.
+        shared = _validated_runtime_root(
+            primary / "gitnexus-shared",
+            label="primary GitNexus shared runtime",
+        )
     mounts = (
         _validated_runtime_component(
             runtime,
@@ -259,13 +274,7 @@ def trusted_gitnexus_runtime_mounts() -> tuple[ReadOnlyMount, ...]:
             f"{SANDBOX_GITNEXUS}/package.json",
             directory=False,
         ),
-        _validated_runtime_component(
-            runtime,
-            "node_modules",
-            f"{SANDBOX_GITNEXUS}/node_modules",
-            directory=True,
-            allow_primary_worktree_symlink=True,
-        ),
+        node_modules,
         _validated_runtime_component(
             runtime,
             "vendor",
@@ -305,7 +314,6 @@ def trusted_gitnexus_runtime_mounts() -> tuple[ReadOnlyMount, ...]:
 
     linked_shared = mounts[2].source / "gitnexus-shared"
     allowed_shared = {shared}
-    primary = _primary_checkout_root(HARNESS_ROOT)
     if primary is not None:
         try:
             allowed_shared.add(
@@ -315,6 +323,7 @@ def trusted_gitnexus_runtime_mounts() -> tuple[ReadOnlyMount, ...]:
                 )
             )
         except SandboxError:
+            # Primary checkout may be absent or unreadable on a standalone eval tree.
             pass
     if not linked_shared.is_symlink() or linked_shared.resolve(strict=True) not in allowed_shared:
         raise SandboxError("pinned GitNexus runtime has an unexpected gitnexus-shared dependency")
diff --git a/eval/workflow_bench/tasks.review.scenarios.yaml b/eval/workflow_bench/tasks.review.scenarios.yaml
index b508d9a72..995e981db 100644
--- a/eval/workflow_bench/tasks.review.scenarios.yaml
+++ b/eval/workflow_bench/tasks.review.scenarios.yaml
@@ -6,8 +6,8 @@ tasks:
     class: review-defect
     repo: ~/GitNexus
     ref: ff86ccf1e79cd7e4175da437ae8aeaf67b64aaa1
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2718-defect.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2718-defect.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2718.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2718.patch && rm -rf eval/workflow_bench
     prompt: Review the historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2718. Report only actionable defects introduced by the local diff.
     verify: test -s review-output.json
     oracle:
@@ -21,8 +21,8 @@ tasks:
   - <<: *review_case
     id: review-pr-2794-defect
     ref: 911151e2304f298a995fcc69c738ad2c6db9393a
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2794-defect.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2794-defect.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2794.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2794.patch && rm -rf eval/workflow_bench
     prompt: Review the historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2794. Report only actionable defects introduced by the local diff.
     oracle:
       command: test -s review-output.json
@@ -32,8 +32,8 @@ tasks:
   - <<: *review_case
     id: review-pr-2108-defect
     ref: 3a4247ec36b5ad86b1123d3bbce8183a643f7434
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2108-defect.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2108-defect.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2108.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2108.patch && rm -rf eval/workflow_bench
     prompt: Review the historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2108. Report only actionable defects introduced by the local diff.
     oracle:
       command: test -s review-output.json
@@ -43,8 +43,8 @@ tasks:
   - <<: *review_case
     id: review-pr-2258-defect
     ref: 78b4077d8acc86f1b0c32e41012174d484e81f12
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2258-defect.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2258-defect.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2258.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2258.patch && rm -rf eval/workflow_bench
     prompt: Review the historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2258. Report only actionable defects introduced by the local diff.
     oracle:
       command: test -s review-output.json
@@ -55,8 +55,8 @@ tasks:
     id: review-pr-2258-clean
     class: review-clean
     ref: 78b4077d8acc86f1b0c32e41012174d484e81f12
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2258-clean.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2258-clean.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2258b.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2258b.patch && rm -rf eval/workflow_bench
     prompt: Review this historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2258. Report only actionable defects introduced by the local diff.
     oracle:
       command: test -s review-output.json
@@ -67,8 +67,8 @@ tasks:
     id: review-pr-2773-clean
     class: review-clean
     ref: 84f584449de02376a8ffc096dceac2e8f732cab5
-    sandbox_copy: [eval/workflow_bench/review_cases/pr-2773-clean.patch]
-    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2773-clean.patch && rm -rf eval/workflow_bench
+    sandbox_copy: [eval/workflow_bench/review_cases/pr-2773.patch]
+    setup: git apply --exclude='eval/workflow_bench/*' eval/workflow_bench/review_cases/pr-2773.patch && rm -rf eval/workflow_bench
     prompt: Review this historical snapshot of https://github.com/abhigyanpatwari/GitNexus/pull/2773. Report only actionable defects introduced by the local diff.
     oracle:
       command: test -s review-output.json