[Code Quality] Add missing unit test file for compiler_yaml_prompt.go prompt-chunking logic

[github-actions]

Description

The Daily Compiler Code Quality Check (2026-08-03) flagged pkg/workflow/compiler_yaml_prompt.go (336 lines, 11 functions) as having no dedicated test file — the most significant maintainability gap identified in that run. The file handles non-trivial prompt-chunking and import-interleaving logic (compile-time inlining vs. runtime-import fallback, expression mapping merges) that currently relies entirely on indirect/integration coverage elsewhere.

Suggested Changes

• Create pkg/workflow/compiler_yaml_prompt_test.go
• Add focused unit tests for:
  • splitContentIntoChunks
  • processOrderedPromptImports
  • processLegacyPromptImports
  • enrichExpressionMappings
  • buildMainWorkflowPromptChunks
• Cover edge cases: empty prompt, single chunk, mixed ordered/legacy imports, expression-mapping merge conflicts

Files Affected

• pkg/workflow/compiler_yaml_prompt.go (source, no changes expected)
• pkg/workflow/compiler_yaml_prompt_test.go (new)

Success Criteria

• New test file exists with coverage for the functions listed above
• go test ./pkg/workflow/... -run TestCompilerYamlPrompt (or similar) passes
• No regressions in existing compiler tests

Source

Extracted from Daily Compiler Code Quality Report - 2026-08-03

Priority

Medium - improves test coverage for non-trivial logic but not blocking.

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• expires on Aug 4, 2026, 12:04 AM UTC-08:00