[P2.2-T04] Update log querying with mode/decision filters

[RichardHightower]

Task: Update log querying with mode/decision filters

Phase: 2.2 - Enhanced Logging
Estimated: 0.5 day
File: cch_cli/src/cli/logs.rs
Depends on: P2.2-T03

Description

Add new filter flags to cch logs command for governance fields.

Acceptance Criteria

• Extend cch logs to filter by mode
• Extend cch logs to filter by decision
• Add --mode <mode> flag
• Add --decision <decision> flag
• Update help text

Usage Examples

cch logs --mode warn           # Show only warned events
cch logs --decision blocked    # Show only blocked events
cch logs --mode audit --limit 50

[RichardHightower]

Completed in PR #72