diff --git a/pyproject.toml b/pyproject.toml
index 72fc765c..9d84b07b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -70,7 +70,7 @@ paperforge = [
 
 [tool.pytest.ini_options]
 addopts = "--ignore=tests/sandbox/00_TestVault/ --strict-markers"
-testpaths = ["tests/unit", "tests/cli", "tests/e2e", "tests/journey", "tests/chaos", "tests/audit"]
+testpaths = ["tests/unit", "tests/cli", "tests/e2e", "tests/journey", "tests/chaos", "tests/audit", "tests/integration"]
 markers = [
     "unit: Unit tests (Level 1) — fast, isolated",
     "cli: CLI contract tests (Level 2) — subprocess boundary",
@@ -78,6 +78,7 @@ markers = [
     "journey: User journey tests (Level 5) — full workflows",
     "chaos: Destructive tests (Level 6) — abnormal scenarios",
     "audit: Consistency audit tests — validate L1 mocks against L4 real pipeline output",
+    "integration: Integration tests — multi-component workflows",
     "slow: Tests that take >30s (skip during development)",
     "snapshot: Tests that use snapshot comparison",
 ]
diff --git a/tests/integration/__init__.py b/tests/integration/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/integration/test_memory_workflow.py b/tests/integration/test_memory_workflow.py
new file mode 100644
index 00000000..2118256f
--- /dev/null
+++ b/tests/integration/test_memory_workflow.py
@@ -0,0 +1,69 @@
+from __future__ import annotations
+
+import json
+import os
+import sqlite3
+import subprocess
+from pathlib import Path
+
+import pytest
+
+from paperforge.memory.db import get_memory_db_path
+
+
+@pytest.mark.integration
+def test_memory_build_and_status_with_test_vault(test_vault: Path):
+    """End-to-end: sync -> memory build -> memory status -> paper-status."""
+    pf = ["python", "-m", "paperforge", "--vault", str(test_vault)]
+    env = {**os.environ, "PYTHONIOENCODING": "utf-8"}
+
+    # 1. Sync to ensure formal-library.json exists
+    result = subprocess.run(
+        pf + ["sync", "--json"], capture_output=True, text=True, encoding="utf-8", env=env
+    )
+    if result.returncode != 0:
+        pytest.skip("Sync failed -- test vault may lack export files")
+
+    # 2. Memory build
+    result = subprocess.run(
+        pf + ["memory", "build", "--json"], capture_output=True, text=True, encoding="utf-8", env=env
+    )
+    assert result.returncode == 0, f"memory build failed: {result.stderr}"
+    data = json.loads(result.stdout)
+    assert data["ok"] is True, f"build result not ok: {data}"
+    assert data["data"]["papers_indexed"] > 0, "expected at least 1 paper indexed"
+
+    # 3. Memory status
+    result = subprocess.run(
+        pf + ["memory", "status", "--json"], capture_output=True, text=True, encoding="utf-8", env=env
+    )
+    assert result.returncode == 0
+    data = json.loads(result.stdout)
+    assert data["data"]["fresh"] is True, f"memory not fresh: {data['data']}"
+    assert data["data"]["needs_rebuild"] is False
+
+    # 4. Paper-status lookup by zotero_key
+    papers_json = subprocess.run(
+        pf + ["memory", "status", "--json"], capture_output=True, text=True, encoding="utf-8", env=env
+    )
+    status_data = json.loads(papers_json.stdout)
+    paper_count = status_data["data"]["paper_count_db"]
+
+    if paper_count > 0:
+        # Get first paper's zotero_key from the db
+        db_path = get_memory_db_path(test_vault)
+        conn = sqlite3.connect(str(db_path))
+        conn.row_factory = sqlite3.Row
+        row = conn.execute("SELECT zotero_key FROM papers LIMIT 1").fetchone()
+        conn.close()
+
+        if row:
+            key = row["zotero_key"]
+            result = subprocess.run(
+                pf + ["paper-status", key, "--json"],
+                capture_output=True, text=True, encoding="utf-8", env=env,
+            )
+            assert result.returncode == 0
+            data = json.loads(result.stdout)
+            assert data["ok"] is True
+            assert data["data"]["resolved"] is True