[log] Add debug logging to 5 additional Go files

[github-actions]

Enhanced the following files with debug logging statements to help with troubleshooting and development:

Files Enhanced

1. pkg/cli/update_command.go - Workflow Update Lifecycle Logging

• Update process initiation with parameters (workflows, allowMajor, force, createPR)
• Workflow scanning and discovery in specified directory
• Latest ref resolution with repository and version detection
• Ref type detection (semantic version tag, branch, or default branch)
• Individual workflow update tracking with source spec
• 3-way merge operations and conflict detection
• Workflow compilation status and failures

2. pkg/parser/mcp.go - MCP Configuration Parsing

• MCP configuration extraction with filter parameter
• Safe-outputs and safe-jobs detection
• Built-in MCP tool processing (github, playwright)
• Custom MCP servers processing with count
• MCP type inference (http from url, stdio from command/container)
• Tool configuration extraction by type
• Container detection for containerized tools

3. pkg/workflow/threat_detection.go - Threat Detection Configuration

• Configuration parsing (enabled/disabled states)
• Threat detection AI engine configuration
• Custom prompt and steps detection
• Job building with step count tracking

4. pkg/workflow/tools_types.go - Tools Configuration

• Tools configuration creation with entry count
• Custom tools count extraction
• GitHub tool configuration parsing (default, string, detailed)
• Tools summary (github, bash, playwright, custom count)

5. pkg/parser/github_urls.go - GitHub URL Parsing

• URL parsing and validation
• Host and type detection
• raw.githubusercontent.com URL handling
• File, PR, issue, and Actions run URL parsing
• URL type segment detection with owner and repo

Quality Checklist

• ✅ Maximum 5 files modified
• ✅ No test files modified
• ✅ Each file has proper logger declaration with correct naming convention
• ✅ Logger arguments don't compute anything or cause side effects
• ✅ Logging messages are meaningful and helpful for debugging
• ✅ No duplicate logging with existing logs
• ✅ Import statements properly formatted
• ✅ Changes validated with make build (no compilation errors)
• ✅ Workflow compilation tested with DEBUG=* ./gh-aw compile dev

Logging Guidelines Followed

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

• No side effects: Logger arguments don't compute values or cause side effects
• Meaningful messages: Each log statement provides useful debugging context
• Proper naming: Logger variables follow naming conventions to avoid conflicts
• Function entry: Key functions log entry with parameters
• Control flow: Important decisions and branches are logged
• State changes: Important state transitions are tracked

Example Debug Output

When running with DEBUG=*, you can now see detailed logging like:

cli:update_command Starting update process: workflows=[ci-doctor], allowMajor=false, force=false, createPR=true
cli:update_command Scanning for workflows with source field: dir=.github/workflows, filter=[ci-doctor]
cli:update_command Found 1 workflows with source field
parser:mcp Extracting MCP configurations with filter: 
parser:mcp Found safe-outputs configuration
workflow:threat_detection Found threat-detection configuration
workflow:threat_detection Threat detection AI engine disabled
workflow:tools_types Creating tools configuration from map with 3 entries
workflow:tools_types Parsed tools: github=true, bash=false, playwright=true, custom=1
parser:github_urls Parsing GitHub URL: https://github.com/owner/repo/pull/123
parser:github_urls Detected host: github.com
parser:github_urls Detected URL type segment: pull for owner/repo
parser:github_urls Parsing pull request URL

🤖 Generated with Claude Code

Co-Authored-By: Claude (noreply@anthropic.com)

AI generated by Go Logger Enhancement