refactor: rename runActionlintOnFile to runActionlintOnFiles

[Copilot]

The unexported runActionlintOnFile accepted []string but its name implied a single file, inconsistent with the exported RunActionlintOnFiles wrapper it backs.

Changes

• pkg/cli/actionlint.go: Renamed runActionlintOnFile → runActionlintOnFiles (function + comment)
• pkg/cli/compile_validation.go: Updated all three call sites

// BeforefuncrunActionlintOnFile(lockFiles []string, verbosebool, strictbool) error {
// AfterfuncrunActionlintOnFiles(lockFiles []string, verbosebool, strictbool) error {

Pure rename — no behavior changes.

[Copilot]

Pull request overview

Renames an unexported helper to accurately reflect that it operates on a slice of lock files, aligning it with the exported RunActionlintOnFiles wrapper.

Changes:

• Renamed runActionlintOnFile → runActionlintOnFiles in pkg/cli/actionlint.go (function + comment).
• Updated RunActionlintOnFiles and two per-file validation call sites to use the new helper name.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
pkg/cli/actionlint.go	Renames the internal actionlint helper and its comment to reflect multi-file behavior.
pkg/cli/compile_validation.go	Updates the wrapper and validation call sites to call the renamed helper.

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