chore: split the compile-check changed-files check file under the line limit

[hatayama]

Summary

• No behavior change. Splits fast_path.go so the final pull request into main (feat: compile-check answers a method-body edit in a large assembly in seconds instead of a full recompile #3318) passes CI.

User Impact

• None. The pull request into main failed build-cli, Go CLI Security Analysis, and test-windows-installers on TestProductionGoFilesStayFocused, because fast_path.go had 575 lines against the architecture test's limit of 500 (it counts every line, unlike the SLOC-based file-length check).

Changes

• The baseline record types and the code that records a baseline after a full compile (RecordBaseline, the generator output hashing, baselineFiles, writeBaselineRecord, and the path helpers) move unchanged to baseline_record.go, next to baseline_record_test.go. The check that reads a baseline stays in fast_path.go (now 401 lines).

Verification

• cli/release-automation: go test ./... passes, including TestProductionGoFilesStayFocused, which failed before.
• cli/dispatcher: go vet ./..., golangci-lint fmt --diff, golangci-lint run (0 issues), the complexity config (0 issues), and go test ./... all pass.
• File length check: no file over the limit.

[coderabbitai]

Note

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⚙️ Run configuration

• Configuration used: Repository: hatayama/unity-cli-loop/.coderabbit.yaml
• Review profile: CHILL
• Plan: Advanced
• Run ID: 47845ebd-70f6-4432-a10d-bab446ef9bbb

📥 Commits

Reviewing files that changed from the base of the PR and between 4ced3f2 and 402c3b1.

📒 Files selected for processing: 2

• cli/dispatcher/internal/compilecheck/baseline_record.go
• cli/dispatcher/internal/compilecheck/fast_path.go

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