[P2.4-T03] Log trust levels in entries

[RichardHightower]

Task: Log trust levels in entries

Phase: 2.4 - Trust Levels
Estimated: 0.25 day
Files: cch_cli/src/logging/, cch_cli/src/cli/explain.rs
Depends on: P2.4-T02

Description

Include trust level in log entries and CLI output (informational only).

Acceptance Criteria

• Include trust level in log entries when present
• Display in cch explain rule output
• No enforcement (informational only in v1.1)

Note

Trust level enforcement is planned for a future version. In v1.1, this is purely informational for tracking script provenance.

[RichardHightower]

Completed in PR #72