refactor(compile): reduce complexity of check_pipeline in src/compile/mod.rs

[github-actions]

Summary

clippy::cognitive_complexity produced no diagnostics under this toolchain (clippy 0.1.98) — it is documented as restriction-only and effectively inert, suggesting too_many_lines / excessive_nesting as replacements. Running those surfaced check_pipeline in src/compile/mod.rs at 105/100 lines (clippy::too_many_lines), the largest untouched, non-test production function not already covered by prior refactor runs.

What changed

Split check_pipeline into four focused pieces, preserving all logic and comments verbatim:

• warn_on_version_mismatch — stderr warning when the pipeline's header compiler version differs from the current one.
• resolve_header_source_path — resolves the header's relative source path against the repo root found by walking up from the pipeline file.
• compile_fresh_from_header_source — reads the source markdown, applies the pending-codemod guard, resolves/merges imports, sanitizes config, resolves repos, and compiles fresh YAML (returns (pipeline_yaml, pipeline_name)).
• check_pipeline — orchestrates the steps above and reports the integrity diff.

No public API changed and no observable behavior changed — only structure.

Verification

• cargo build --all-features — clean.
• cargo clippy --all-targets --all-features — no warnings.
• cargo clippy -- -W clippy::too_many_lines — check_pipeline no longer flagged.
• cargo test — full suite passes (3406+ tests, including tests/codemod_tests.rs, which directly exercises the check CLI command / check_pipeline).

Before / after

	Lines	Lint
Before	105 (limit 100)	clippy::too_many_lines
After	4 functions, none exceeding threshold (helper compile_fresh_from_header_source ~70 lines)	not flagged

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Generated by Cyclomatic Complexity Reducer · auto · 93.6 AIC · ⌖ 11.1 AIC · ⊞ 9.7K · ◷

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