feat: enable SQLite WAL mode for all databases (AGI ticket #1) (#153)

src/timmy/semantic_memory.py

@@ -115,8 +115,7 @@ class SemanticMemory:
         """Initialize SQLite with vector storage."""
         self.db_path.parent.mkdir(parents=True, exist_ok=True)
         conn = sqlite3.connect(str(self.db_path))
-        conn.execute(
-            """
+        conn.execute("""
             CREATE TABLE IF NOT EXISTS chunks (
                 id TEXT PRIMARY KEY,
                 source TEXT NOT NULL,
@@ -125,8 +124,7 @@ class SemanticMemory:
                 created_at TEXT NOT NULL,
                 source_hash TEXT NOT NULL
             )
-        """
-        )
+        """)
         conn.execute("CREATE INDEX IF NOT EXISTS idx_source ON chunks(source)")
         conn.commit()
         conn.close()