[plan] Complete safe-output pattern consistency

[github-actions]

Overview

This tracking issue covers refactoring to complete the safe-output pattern across all 27 action types by extracting inline parsing logic from safe_outputs.go into dedicated parse*Config() functions.

Source: Issue #5382

Problem

Currently, 3 of 27 safe-output configurations have their parsing logic embedded inline in safe_outputs.go (lines 156-225, ~70 lines) instead of following the established pattern used by the other 24 files.

Files affected:

• add_labels.go - missing parseAddLabelsConfig()
• assign_milestone.go - missing parseAssignMilestoneConfig()
• assign_to_agent.go - missing parseAssignToAgentConfig()

Goal

Achieve 100% pattern compliance (27/27 files) by extracting inline parsing into dedicated functions, improving maintainability and consistency.

Planned Tasks

1. Extract add-labels parsing logic (#aw_add1labels2345)
2. Extract assign-milestone parsing logic (#aw_mile3stone4567)
3. Extract assign-to-agent parsing logic (#aw_agent5assign678)

Success Criteria

• All 3 parse functions extracted to their respective files
• safe_outputs.go reduced by ~60 lines
• All tests pass (make test-unit)
• Pattern compliance: 27/27 files (100%)
• Generated YAML is byte-for-byte identical

Impact

Risk: LOW | Effort: 2-3 hours | Impact: HIGH

Completes established architectural pattern, improves discoverability, and reduces file size of safe_outputs.go.
Related to #5382

AI generated by Plan Command for #5382