[P2.4-T01] Add trust field to run action

[RichardHightower]

Task: Add trust field to run action

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

Description

Extend the run action to support an optional trust level field.

Acceptance Criteria

• Extend run action to support object format
• Add optional trust field: local | verified | untrusted
• Maintain backward compatibility with string format
• Parse both formats correctly

YAML Formats

# Simple format (existing - must continue to work)
actions:
  run: .claude/validators/check.py

# Extended format (new)
actions:
  run:
    script: .claude/validators/check.py
    trust: local

Trust Level Semantics

Trust	Meaning
local	User-authored script
verified	Signed skill package
untrusted	External source

[RichardHightower]

Completed in PR #72