diff --git a/client/main.py b/client/main.py
index f332efc..e4e76c7 100644
--- a/client/main.py
+++ b/client/main.py
@@ -1,8 +1,11 @@
-"""Smart Assistant client entry point. Implemented in Plan 3."""
+"""Smart Assistant client entry point.
+
+The composition root lives in main(); see Plan 3 Task 11 for the full wiring.
+"""
 
 
 def main() -> None:
-    raise SystemExit("client.main: placeholder; full implementation comes in Plan 3.")
+    raise SystemExit("client.main: not yet implemented (see Plan 3 Task 11).")
 
 
 if __name__ == "__main__":
diff --git a/client/pair.py b/client/pair.py
index 91b78e3..ceebfae 100644
--- a/client/pair.py
+++ b/client/pair.py
@@ -1,8 +1,8 @@
-"""Smart Assistant pairing CLI. Implemented in Plan 3."""
+"""Pairing CLI; see Plan 3 Task 6 for the full implementation."""
 
 
 def main() -> None:
-    raise SystemExit("client.pair: placeholder; full implementation comes in Plan 3.")
+    raise SystemExit("client.pair: not yet implemented (see Plan 3 Task 6).")
 
 
 if __name__ == "__main__":
diff --git a/client/tests/__init__.py b/client/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/client/tests/conftest.py b/client/tests/conftest.py
new file mode 100644
index 0000000..42a30c5
--- /dev/null
+++ b/client/tests/conftest.py
@@ -0,0 +1,8 @@
+"""Shared pytest fixtures for the client test suite."""
+import sys
+from pathlib import Path
+
+# Make the repo root importable so `import client.<module>` works without install.
+REPO_ROOT = Path(__file__).resolve().parents[2]
+if str(REPO_ROOT) not in sys.path:
+    sys.path.insert(0, str(REPO_ROOT))
diff --git a/requirements-dev.txt b/requirements-dev.txt
new file mode 100644
index 0000000..fabfe78
--- /dev/null
+++ b/requirements-dev.txt
@@ -0,0 +1,3 @@
+pytest>=8.0
+pytest-asyncio>=0.23
+responses>=0.25