Phase 0: FastMCP scaffold with ping tool

Set up the familiar package (src layout, uv/hatchling) with a FastMCP
server exposing a read-only ping health tool. Add pytest smoke tests with
80% coverage gate. Flesh out the README with the project vision and roadmap.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

tests/test_server.py

@@ -0,0 +1,19 @@
+"""Phase 0 smoke tests."""
+
+import asyncio
+
+from familiar import __version__
+from familiar.server import mcp, ping
+
+
+def test_ping_reports_ok():
+    result = ping()
+    assert result["status"] == "ok"
+    assert result["server"] == "familiar"
+    assert result["version"] == __version__
+    assert "time_utc" in result
+
+
+def test_server_exposes_ping_tool():
+    tools = asyncio.run(mcp.list_tools())
+    assert "ping" in {t.name for t in tools}