[log] Add debug logging to 5 files for improved troubleshooting

[github-actions]

Summary

Added debug logging statements to 5 files to improve troubleshooting capabilities and help developers understand the execution flow during development:

• pkg/cli/run.go: Added logging for workflow run cancellation operations

  • Logs workflow IDs and lock file names being cancelled
  • Tracks the number of runs found and individual cancellations
  • Reports completion status

• pkg/workflow/fetch.go: Added logging for MCP fetch server configuration

  • Logs when web-fetch tool is requested or skipped
  • Tracks engine support detection
  • Records successful configuration additions

• pkg/workflow/npm.go: Added logging for npm package validation

  • Logs the number of packages being validated
  • Tracks individual package validation results
  • Reports validation failures and successes

• pkg/workflow/pip.go: Added logging for pip/uv package validation

  • Logs package validation start and pip command detection
  • Tracks individual package validation for pip and uv
  • Reports fallback to pip3 when needed

• pkg/workflow/env.go: Added logging for header writing operations

  • Logs the number of headers being written to YAML
  • Reports completion status

Guidelines Followed

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

✅ Logger naming convention: pkg:filename pattern (e.g., cli:cancel, workflow:fetch)
✅ Logger arguments have no side effects or computations
✅ Logging messages are meaningful and helpful for debugging
✅ Logs added at function entry, control flow decisions, and important operations
✅ No test files modified (*_test.go)
✅ Maximum 5 files per PR maintained

Test Plan

• Build validation: make build passes without errors
• Debug logging test: DEBUG=* ./gh-aw compile dev shows new logging output
• Verified logger naming conflicts resolved (renamed runLog to cancelLog in run.go)
• Confirmed no side effects in log arguments
• All modified files compile successfully

Example Debug Output

workflow:fetch web-fetch tool not requested, skipping MCP fetch server +74ms

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