Show list of failed workflows in compile error summary

[Copilot]

Overview

The compile command now displays a clear list of workflows that failed compilation after the error/warning summary, making it easier to identify which workflows need attention without scrolling through detailed error messages.

Changes

Before

✗ failed to parse workflow file /path/bad-1.md: error message...
✗ failed to parse workflow file /path/bad-2.md: error message...
✓ good-1.md (83.5 KB)
✗ Compiled 3 workflow(s): 2 error(s), 0 warning(s)
✗ compilation failed

After

✗ failed to parse workflow file /path/bad-1.md: error message...
✗ failed to parse workflow file /path/bad-2.md: error message...
✓ good-1.md (83.5 KB)
✗ Compiled 3 workflow(s): 2 error(s), 0 warning(s)
✗ Failed workflows:
  - bad-1.md
  - bad-2.md
✗ compilation failed

Implementation Details

• Extended CompilationStats struct with a FailedWorkflows field to track workflow names that fail compilation
• Updated all compilation error tracking points (7 locations) to record failed workflow filenames
• Enhanced printCompilationSummary to display the failed workflows list when errors are present
• Only shows the list when there are actual failures (successful compilations remain unchanged)
• Works consistently across all compilation modes: specific files, all files, and watch mode

Testing

• Added TestPrintCompilationSummaryWithFailedWorkflows unit test
• All existing tests pass without modification
• Manually verified with multiple test scenarios including mixed success/failure cases

Benefits

• Quick identification: Users can immediately see which workflows failed at a glance
• Improved developer experience: No need to scroll through detailed error messages to find workflow names
• Consistent behavior: Works the same way in all compilation modes
• Minimal impact: Surgical changes that don't affect successful compilations or existing functionality

Original prompt

In the compile tool show the list of worflows that fail compilation after the error warning summary

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