feat: add psagentai agent with deployment and configuration

Initial project setup including the main agent script, configuration
files, profile JSON state, systemd service unit, startup script,
deployment documentation, and Python dependencies.

Includes .env, venv/, and __pycache__/ which should likely be
excluded via .gitignore to avoid committing secrets and artifacts.

venv/lib/python3.11/site-packages/sniffio/_tests/test_sniffio.py

@@ -0,0 +1,84 @@
+import os
+import sys
+
+import pytest
+
+from .. import (
+    current_async_library, AsyncLibraryNotFoundError,
+    current_async_library_cvar, thread_local
+)
+
+
+def test_basics_cvar():
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+    token = current_async_library_cvar.set("generic-lib")
+    try:
+        assert current_async_library() == "generic-lib"
+    finally:
+        current_async_library_cvar.reset(token)
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+
+def test_basics_tlocal():
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+    old_name, thread_local.name = thread_local.name, "generic-lib"
+    try:
+        assert current_async_library() == "generic-lib"
+    finally:
+        thread_local.name = old_name
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+
+def test_asyncio():
+    import asyncio
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+    ran = []
+
+    async def this_is_asyncio():
+        assert current_async_library() == "asyncio"
+        # Call it a second time to exercise the caching logic
+        assert current_async_library() == "asyncio"
+        ran.append(True)
+
+    asyncio.run(this_is_asyncio())
+    assert ran == [True]
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+
+@pytest.mark.skipif(
+    sys.version_info >= (3, 12),
+    reason=
+    "curio broken on 3.12 (https://github.com/python-trio/sniffio/pull/42)",
+)
+def test_curio():
+    import curio
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()
+
+    ran = []
+
+    async def this_is_curio():
+        assert current_async_library() == "curio"
+        # Call it a second time to exercise the caching logic
+        assert current_async_library() == "curio"
+        ran.append(True)
+
+    curio.run(this_is_curio)
+    assert ran == [True]
+
+    with pytest.raises(AsyncLibraryNotFoundError):
+        current_async_library()