feat: add centralized logging with configurable debug levels

- Create src/logger.py with Python logging module
- Add 4 debug levels: 1=CRITICAL, 2=WARNING, 3=INFO, 4=DEBUG
- Level 4 includes reasoning, VFS info, and available tools
- Level 4 auto-enables file output (both mode)
- Update agent.py and runner.py to use logger instead of print
- Update config.yaml.example with logging configuration
- Update README with logging documentation

1 files changed, 16 insertions, 0 deletions

diff --git a/src/main.py b/src/main.py
index ad4015a..36297bc 100644
--- a/src/main.py
+++ b/src/main.py
@@ -3,10 +3,26 @@ Main entry point for running experiments.
 Uses config.yaml to define what to run.
 """
 from runner import run_from_config
+from logger import setup_logger
+from config_loader import ConfigLoader
 
 
 def main():
     """Run all experiments defined in config.yaml."""
+    # Load config to get logging settings
+    config = ConfigLoader("config.yaml")
+    config.load()
+
+    # Initialize logger
+    log_config = config.logging_config
+    setup_logger(
+        name="experiment",
+        level=log_config.get('level', 3),
+        log_format=log_config.get('format', '[{level}] {message}'),
+        output=log_config.get('output', 'console'),
+        log_file=log_config.get('file')
+    )
+
     run_from_config("config.yaml")