[log] Add debug logging to import processing, safe outputs PR compilation, and analysis functions

[github-actions]

Summary

This PR enhances debug logging across 5 Go files following the project's logging guidelines from AGENTS.md:

• pkg/parser/import_processor.go - Added logging to import processing functions for better debugging of import resolution, duplicate detection, and agent file handling
• pkg/workflow/compiler_safe_outputs_prs.go - Added logger declaration and logging to pull request step configuration functions to track draft settings, if-no-changes behavior, and pre-step builds
• pkg/cli/audit_report_analysis.go - Enhanced performance metrics generation with cost efficiency and tool usage logging
• pkg/parser/frontmatter_content.go - Added logging to frontmatter extraction functions to track content processing
• pkg/cli/tokens_bootstrap.go - Added logging to token bootstrap process to track engine-specific checks and missing token detection

All logging follows project guidelines:

• Logger declarations use correct pkg:filename naming convention
• Log statements have no side effects in arguments
• Logging is meaningful and helps with troubleshooting
• Added logging at function entry points and important control flow decisions

Changes

Files Enhanced

1. pkg/workflow/compiler_safe_outputs_prs.go (304 lines)

   • Added logger declaration: prSafeOutputsLog = logger.New("workflow:compiler_safe_outputs_prs")
   • Added logging in buildCreatePullRequestStepConfig for draft and if-no-changes settings
   • Added logging in buildUpdatePullRequestStepConfig for update operations
   • Added logging in buildCreatePullRequestPreStepsConsolidated for app configuration and trial mode detection

2. pkg/parser/import_processor.go (447 lines)

   • Added logging in ProcessImportsFromFrontmatter with base directory parameter
   • Added duplicate import detection logging
   • Added multiple agent files detection logging

3. pkg/cli/audit_report_analysis.go (364 lines)

   • Added cost efficiency calculation logging
   • Added most used tool identification logging with call counts

4. pkg/parser/frontmatter_content.go (301 lines)

   • Added logging in ExtractFrontmatterString to track content size
   • Added empty frontmatter fields detection logging

5. pkg/cli/tokens_bootstrap.go (283 lines)

   • Added logging in runTokensBootstrap with engine, owner, and repo parameters
   • Added engine-specific token checking logging with counts
   • Added missing tokens detection logging

Validation

• Built successfully with make build
• Tested with DEBUG=* ./gh-aw compile dev - logging output appears correctly
• No compilation errors
• No test files modified

Cache Update

Updated persistent cache to track these 5 files as processed, bringing the total enhanced files count to 24 across sessions 21-26.

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