Function init_from_dir 

pub fn init_from_dir(preferred: &Path)

Initialize tracing subscriber from a preferred directory or current working directory.

Search order:

1. <preferred>/logging.yml
2. ./logging.yml
3. Defaults (info level, ANSI enabled, with timestamps)

Arguments

• preferred - Directory to search first (typically the config file’s parent directory)

Behavior

• Uses try_init() - silently ignores if a subscriber is already installed
• Emits a debug-level diagnostic line (via the tracing subscriber) on success or when already initialized (may be filtered)
• Never panics