Enforce kebab case filenames

[kzhou314]

Fixes github/accessibility#10721

Enforce kebab-case convention for all .ts files under src and tests through manual rename and ESlint configuration.

[Copilot]

✅ Ready to approve

The renames, import updates, and ESLint enforcement are internally consistent and the repository references appear fully updated to the new kebab-case filenames.

Note: this review does not count toward required approvals for merging.

Pull request overview

This PR enforces a kebab-case filename convention across the TypeScript code under src/ and tests/, updating imports to match renamed files and adding an ESLint rule to prevent regressions.

Changes:

• Renamed rule/util files and updated rule/test imports to use kebab-case paths (and correct relative paths in unit tests).
• Added eslint-plugin-check-file and configured ESLint to enforce kebab-case .ts filenames under src/** and tests/**.
• Introduced/registered the missing-alt-text rule and added normalize-alt-text utility used by multiple rules.

File summaries

File	Description
tests/unit/vague-alt-text.test.ts	Updates imports to kebab-case rule filename and correct helpers path.
tests/unit/repeated-alt-text.test.ts	Updates imports to kebab-case rule filename and correct helpers path.
tests/unit/missing-alt-text.test.ts	Updates imports to kebab-case rule filename and correct helpers path.
src/utils/normalize-alt-text.ts	Adds kebab-case utility module for alt-text normalization used by rules.
src/rules/vague-alt-text.ts	Updates normalize utility import to kebab-case filename.
src/rules/repeated-alt-text.ts	Updates normalize utility import to kebab-case filename.
src/rules/placeholder-alt-text.ts	Updates normalize utility import to kebab-case filename.
src/rules/missing-alt-text.ts	Adds kebab-case rule module for detecting missing/whitespace-only alt text.
src/rules/index.ts	Updates rule imports to kebab-case filenames and ensures registry points at renamed modules.
package.json	Adds eslint-plugin-check-file devDependency (supports filename convention enforcement).
package-lock.json	Locks eslint-plugin-check-file and its transitive dependencies.
eslint.config.js	Configures check-file/filename-naming-convention for src/**/*.ts and tests/**/*.ts.

Copilot's findings

• Files reviewed: 9/12 changed files
• Comments generated: 0

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[JoyceZhu]

Just to explicitly check, you and @taarikashenafi discussed and agreed on kebab case?

[kzhou314]

Just to explicitly check, you and @taarikashenafi discussed and agreed on kebab case?

Yeah, Taarik and I agreed on this yesterday. I believe this follows the main scanner repo's file naming conventions (?)

[JoyceZhu]

Awesome you found another library which does this!