[P2.4-T02] Create TrustLevel enum

[RichardHightower]

Task: Create TrustLevel enum

Phase: 2.4 - Trust Levels
Estimated: 0.25 day
File: cch_cli/src/models/mod.rs

Description

Create the TrustLevel enum for validator script provenance tracking.

Acceptance Criteria

• Values: Local, Verified, Untrusted
• Implement parsing (case-insensitive)
• Default: None (unspecified)

Code Reference

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "lowercase")]
pub enum TrustLevel {
    Local,
    Verified,
    Untrusted,
}

[RichardHightower]

Completed in PR #72