Function load_cc_rules 

pub fn load_cc_rules(working_dir: &Path) -> CcRules

Load CC permission rules from all settings file paths.

Walks up from working_dir to find the nearest .claude/ directory, then reads (in order):

1. {project}/.claude/settings.json
2. {project}/.claude/settings.local.json
3. ~/.claude/settings.json
4. ~/.claude/settings.local.json