bench: add benchmark runners, results docs, and test suite

Benchmarks: LongMemEval, LoCoMo, ConvoMem, MemBench runners with
methodology docs and hybrid retrieval analysis.

Tests: config, miner, convo_miner, normalize — 9 tests, all passing.

tests/test_normalize.py

@@ -0,0 +1,31 @@
+import os
+import json
+import tempfile
+from mempalace.normalize import normalize
+
+
+def test_plain_text():
+    f = tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False)
+    f.write("Hello world\nSecond line\n")
+    f.close()
+    result = normalize(f.name)
+    assert "Hello world" in result
+    os.unlink(f.name)
+
+
+def test_claude_json():
+    data = [{"role": "user", "content": "Hi"}, {"role": "assistant", "content": "Hello"}]
+    f = tempfile.NamedTemporaryFile(mode="w", suffix=".json", delete=False)
+    json.dump(data, f)
+    f.close()
+    result = normalize(f.name)
+    assert "Hi" in result
+    os.unlink(f.name)
+
+
+def test_empty():
+    f = tempfile.NamedTemporaryFile(mode="w", suffix=".txt", delete=False)
+    f.close()
+    result = normalize(f.name)
+    assert result.strip() == ""
+    os.unlink(f.name)