[log] Add debug logging to runtime validation and schedule scattering

[github-actions]

Summary

Enhanced debug logging in two key Go files to improve troubleshooting capabilities:

• pkg/workflow/runtime_validation.go (16 new log statements)
• pkg/parser/schedule_fuzzy_scatter.go (11 new log statements)

Changes Made

Runtime Validation Logging

Added comprehensive logging to validation functions:

• Expression size validation with line counts and size limits
• Container image validation with per-tool progress
• Runtime package validation (node/python/uv)
• Package collection and deduplication tracking
• Cache ID uniqueness validation
• Secret reference format validation
• Firewall configuration validation

Schedule Scattering Logging

Added logging for fuzzy schedule scattering logic:

• Function entry with fuzzy cron expression and workflow ID
• Scatter results for all fuzzy schedule patterns (DAILY, WEEKLY, HOURLY, etc.)
• Original vs scattered time comparisons
• Hash values for debugging deterministic behavior
• Unsupported schedule type warnings

Validation

• ✅ make build - Successful compilation
• ✅ Debug logging tested with DEBUG=* ./gh-aw compile dev
• ✅ Log output confirmed working correctly

Logging Best Practices

All changes follow the project's logging guidelines from AGENTS.md:

• Logger naming convention: pkg:filename pattern
• Function entry logging with parameters (no side effects)
• Important state changes and control flow logging
• Before/after expensive operations
• Meaningful, helpful debug messages

Notes

Original goal was 5 files, but many candidate files already had adequate logging. These 2 files represent the most impactful improvements with minimal existing debug logging.

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• expires on Feb 9, 2026, 7:33 AM UTC