feat(logging): Implement session-based log organization

tests/test_session_logging.py

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+import os
+import shutil
+import pytest
+from pathlib import Path
+from datetime import datetime
+from unittest.mock import patch
+import session_logger
+import tomllib
+
+@pytest.fixture
+def temp_logs(tmp_path):
+    # Mock _LOG_DIR in session_logger
+    original_log_dir = session_logger._LOG_DIR
+    session_logger._LOG_DIR = tmp_path / "logs"
+    session_logger._LOG_DIR.mkdir(parents=True, exist_ok=True)
+    
+    # Mock _SCRIPTS_DIR
+    original_scripts_dir = session_logger._SCRIPTS_DIR
+    session_logger._SCRIPTS_DIR = tmp_path / "scripts" / "generated"
+    session_logger._SCRIPTS_DIR.mkdir(parents=True, exist_ok=True)
+    
+    yield tmp_path / "logs"
+    
+    # Cleanup: Close handles if open
+    session_logger.close_session()
+    session_logger._LOG_DIR = original_log_dir
+    session_logger._SCRIPTS_DIR = original_scripts_dir
+
+def test_open_session_creates_subdir_and_registry(temp_logs):
+    label = "test-label"
+    # We can't easily mock datetime.datetime.now() because it's a built-in
+    # but we can check the resulting directory name pattern
+    
+    session_logger.open_session(label=label)
+    
+    # Check that a subdirectory was created
+    subdirs = list(temp_logs.iterdir())
+    # One is the log_registry.toml, one is the session dir
+    session_dirs = [d for d in subdirs if d.is_dir()]
+    assert len(session_dirs) == 1
+    session_dir = session_dirs[0]
+    
+    assert session_dir.name.endswith(f"_{label}")
+    
+    # Check for log files
+    assert (session_dir / "comms.log").exists()
+    assert (session_dir / "toolcalls.log").exists()
+    assert (session_dir / "apihooks.log").exists()
+    assert (session_dir / "clicalls.log").exists()
+    
+    # Check registry
+    registry_path = temp_logs / "log_registry.toml"
+    assert registry_path.exists()
+    
+    with open(registry_path, "rb") as f:
+        data = tomllib.load(f)
+        assert session_dir.name in data
+        assert data[session_dir.name]["path"] == str(session_dir)