[P2.1-T04] Implement priority-based rule sorting

[RichardHightower]

Task: Implement priority-based rule sorting

Phase: 2.1 - Core Governance
Estimated: 0.5 day
File: cch_cli/src/hooks/processor.rs
Depends on: P2.1-T03

Description

Sort rules by priority before matching, with higher numbers running first.

Acceptance Criteria

• Create function sort_rules_by_priority(rules: &mut Vec<Rule>)
• Sort by priority descending (higher first)
• Stable sort to preserve file order for same priority
• Default priority = 0 for rules without explicit priority
• Call sorting before rule matching in hook processor
• Add unit tests for sorting behavior

Code Reference

pub fn sort_rules_by_priority(rules: &mut [Rule]) {
    rules.sort_by(|a, b| {
        let priority_a = a.priority.unwrap_or(0);
        let priority_b = b.priority.unwrap_or(0);
        priority_b.cmp(&priority_a) // Descending order
    });
}

Tests Required

• Higher priority rules run first
• Same priority preserves file order (stable sort)
• Default priority (0) sorts after explicit priorities

[RichardHightower]

Completed in PR #72