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_miner.py

@@ -0,0 +1,36 @@
+import os
+import tempfile
+import shutil
+import yaml
+import chromadb
+from mempalace.miner import mine
+
+
+def test_project_mining():
+    tmpdir = tempfile.mkdtemp()
+    # Create a mini project
+    os.makedirs(os.path.join(tmpdir, "backend"))
+    with open(os.path.join(tmpdir, "backend", "app.py"), "w") as f:
+        f.write("def main():\n    print('hello world')\n" * 20)
+    # Create config
+    with open(os.path.join(tmpdir, "mempalace.yaml"), "w") as f:
+        yaml.dump(
+            {
+                "wing": "test_project",
+                "rooms": [
+                    {"name": "backend", "description": "Backend code"},
+                    {"name": "general", "description": "General"},
+                ],
+            },
+            f,
+        )
+
+    palace_path = os.path.join(tmpdir, "palace")
+    mine(tmpdir, palace_path)
+
+    # Verify
+    client = chromadb.PersistentClient(path=palace_path)
+    col = client.get_collection("mempalace_drawers")
+    assert col.count() > 0
+
+    shutil.rmtree(tmpdir)