Function resolve_log_level 

pub fn resolve_log_level(
    cli_level: Option<&str>,
    verbose: u8,
    env_val: Option<&str>,
) -> LevelFilter

Resolve the effective log level from (highest priority first):

1. env_val — CCS_LOG env var (full EnvFilter syntax)
2. cli_level — –log-level flag (single level string)
3. verbose — -v count: 0-1=info, 2=debug, 3+=trace
4. Default: info