diff --git a/tests/fixtures/synthetic_src/aggregate.py b/tests/fixtures/synthetic_src/aggregate.py
index 5bb55800..07f4eab9 100644
--- a/tests/fixtures/synthetic_src/aggregate.py
+++ b/tests/fixtures/synthetic_src/aggregate.py
@@ -1,15 +1,15 @@
 """Synthetic aggregate module for the v2 audit integration tests."""
 from __future__ import annotations
-from typing import Any
+from typing import Any, List
 
-FileItems = list[dict[str, Any]]
+FileItems = List[dict[str, Any]]
 
-def build_file_items() -> list[dict[str, Any]]:
+def build_file_items() -> FileItems:
  data: FileItems = [{"path": "a.py", "view_mode": "full"}, {"path": "b.py", "view_mode": "summary"}]
  return data
 
-def format_paths(items: FileItems) -> list[str]:
- out: list[str] = []
+def format_paths(items: FileItems) -> List[str]:
+ out: List[str] = []
  for item in items:
   path = item["path"]
   view_mode = item["view_mode"]
diff --git a/tests/fixtures/synthetic_src/ai_client.py b/tests/fixtures/synthetic_src/ai_client.py
index fc3d6029..09ffe215 100644
--- a/tests/fixtures/synthetic_src/ai_client.py
+++ b/tests/fixtures/synthetic_src/ai_client.py
@@ -1,15 +1,15 @@
 """Synthetic AI client for the v2 audit integration tests."""
 from __future__ import annotations
-from typing import Any
+from typing import Any, List
 
 Metadata = dict[str, Any]
-History = list[dict[str, Any]]
+History = List[dict[str, Any]]
 
-def send_result() -> dict[str, Any]:
+def send_result() -> Metadata:
  data: Metadata = {"role": "user", "content": "hello"}
  return data
 
-def append_history() -> list[dict[str, Any]]:
+def append_history() -> History:
  data: History = []
  return data
 
diff --git a/tests/test_code_path_audit_integration.py b/tests/test_code_path_audit_integration.py
new file mode 100644
index 00000000..c40f5ccd
--- /dev/null
+++ b/tests/test_code_path_audit_integration.py
@@ -0,0 +1,109 @@
+"""Integration tests for src.code_path_audit v2."""
+from __future__ import annotations
+import tempfile
+from pathlib import Path
+from src.code_path_audit import (
+ run_audit,
+ render_rollups,
+)
+
+FIXTURE_SRC = "tests/fixtures/synthetic_src"
+FIXTURE_INPUTS = "tests/fixtures/audit_inputs"
+
+def test_integration_synthetic_src_produces_3_real_aggregates() -> None:
+ """The full run_audit against the synthetic src/ produces 10 real + 3 candidate profiles."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  real_profiles = [p for p in result.data.aggregate_profiles if not p.is_candidate]
+  candidate_profiles = [p for p in result.data.aggregate_profiles if p.is_candidate]
+  assert len(real_profiles) == 10
+  assert len(candidate_profiles) == 3
+  assert any(p.name == "Metadata" for p in real_profiles)
+  assert any(p.name == "FileItems" for p in real_profiles)
+  assert any(p.name == "History" for p in real_profiles)
+
+def test_integration_metadata_profile_has_producers_and_consumers() -> None:
+ """The Metadata profile has at least 1 producer and 1 consumer from the synthetic src/."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  metadata = next(p for p in result.data.aggregate_profiles if p.name == "Metadata")
+  assert len(metadata.producers) >= 1
+
+def test_integration_metadata_memory_dim_is_discussion() -> None:
+ """The Metadata profile's memory_dim is 'discussion' (canonical mapping)."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  metadata = next(p for p in result.data.aggregate_profiles if p.name == "Metadata")
+  assert metadata.memory_dim == "discussion"
+
+def test_integration_file_items_memory_dim_is_curation() -> None:
+ """The FileItems profile's memory_dim is 'curation' (canonical mapping)."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  file_items = next(p for p in result.data.aggregate_profiles if p.name == "FileItems")
+  assert file_items.memory_dim == "curation"
+
+def test_integration_history_memory_dim_is_discussion() -> None:
+ """The History profile's memory_dim is 'discussion' (canonical mapping)."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  history = next(p for p in result.data.aggregate_profiles if p.name == "History")
+  assert history.memory_dim == "discussion"
+
+def test_integration_missing_audit_inputs_tolerated() -> None:
+ """run_audit tolerates missing audit inputs."""
+ with tempfile.TemporaryDirectory() as tmp:
+  inputs_dir = str(Path(tmp) / "nonexistent")
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=inputs_dir,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  assert len(result.data.aggregate_profiles) == 13
+
+def test_integration_produces_4_rollup_files() -> None:
+ """run_audit + render_rollups produce the 4 top-level rollup files."""
+ with tempfile.TemporaryDirectory() as tmp:
+  result = run_audit(
+   src_dir=FIXTURE_SRC,
+   audit_inputs_dir=FIXTURE_INPUTS,
+   output_dir=tmp,
+   date="2026-06-22",
+  )
+  assert result.ok
+  rollup_paths = render_rollups(result.data, Path(tmp) / "2026-06-22")
+  for name, path in rollup_paths.items():
+   assert Path(path).exists()
+   assert Path(path).stat().st_size > 0
\ No newline at end of file