[WIP] Decompose 6 source files exceeding AGENTS.md limit

[Copilot]

• Decompose pkg/workflow/frontmatter_extraction_yaml.go (1087→707 lines) → extracted frontmatter_extraction_conditions.go (~200 lines) and frontmatter_extraction_commands.go (~155 lines)
• Decompose pkg/workflow/domains.go (1011→368 lines) → extracted domains_network.go (~464 lines) and domains_sanitization.go (~196 lines)
• Decompose pkg/cli/audit_diff.go (1009→402 lines) → extracted audit_diff_mcp.go (~107 lines) and audit_diff_metrics.go (~509 lines)
• Decompose pkg/workflow/cache.go (1004→316 lines) → extracted cache_steps.go (~400 lines) and cache_job.go (~300 lines)
• Decompose pkg/workflow/compiler_jobs.go (997→479 lines) → extracted compiler_jobs_custom.go (~367 lines) and compiler_jobs_steps.go (~157 lines)
• Decompose pkg/workflow/threat_detection.go (976→549 lines) → extracted threat_detection_engine.go (~436 lines, includes buildDetectionJob)
• Run make build — passes
• Run make fmt — passes
• Run targeted tests (TestCompile, TestBuildDetection, TestCache, TestDomain) — all pass

[github-actions]

Hey @Copilot 👋 — thanks for tackling the large-file decomposition work! Breaking up oversized source files is exactly the kind of housekeeping that keeps the codebase healthy and aligns with the AGENTS.md limits.

A couple of things to address before this is ready:

• No files changed yet — the diff is currently empty. The PR body has a great checklist, but the actual splits haven't been committed yet. Work through each decomposition item in the checklist.
• Missing tests — once the file splits are in place, ensure the existing unit tests still cover the moved code and add any new tests needed for logic that moves into the new files. The checklist already mentions running make test-unit, which is a good sign.

If you'd like a hand finishing this up, here's a ready-to-use agent prompt:

Complete the file decomposition described in PR #29357 for github/gh-aw.

For each of the following source files, split the file at logical boundaries into the two named output files (keeping all existing Go package declarations, imports, and function signatures intact):

1. pkg/workflow/frontmatter_extraction_yaml.go → frontmatter_extraction_conditions.go + frontmatter_extraction_commands.go
2. pkg/workflow/domains.go → domains_network.go + domains_sanitization.go
3. pkg/cli/audit_diff.go → audit_diff_mcp.go + audit_diff_metrics.go
4. pkg/workflow/cache.go → cache_steps.go + cache_job.go
5. pkg/workflow/compiler_jobs.go → compiler_jobs_custom.go + compiler_jobs_steps.go
6. pkg/workflow/threat_detection.go → threat_detection_engine.go

After each split, delete the original file. Then run:
  make fmt && make build && make test-unit
and fix any compilation or test failures before moving to the next file.

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