fix: detect dependency

[nyaomaru]

Summary

Close #77

Keep dependency updates in Chore during categorization

Description

• Detect dependency-only updates and keep them in Chore during categorization and postprocessing
• Refactor section handling to reduce repeated logic and improve readability
• Centralize bullet-prefix regex into shared markdown constants
• Cast jest.fn() to FetchMock to satisfy global.fetch’s signature
• Keep mock implementations compatible with the fetch input types
• Ensure mocked responses are typed as Response to quiet TS

[Copilot]

Pull request overview

Improves changelog classification so dependency-only updates (e.g. chore(deps): ...) remain under Chore instead of being miscategorized under Changed, addressing issue #77.

Changes:

• Add dependency-update title detection and use it to keep dependency bumps in Chore during category tuning and markdown postprocessing.
• Refactor section postprocessing to reduce repeated section-handling logic and centralize the bullet-prefix regex in shared markdown constants.
• Update Jest tests/mocks to be more type-correct around fetch mocking.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/utils/section-postprocess.test.ts	Adds/updates test to verify dependency bullets are moved from Changed to Chore.
tests/utils/github-auth.test.ts	Refactors fetch mocking to better match global.fetch typing.
tests/utils/dependency-update.test.ts	Adds unit tests for dependency-update title detection heuristics.
tests/utils/category-tune.test.ts	Adds test ensuring dependency-only updates stay in Chore after tuning.
src/utils/section-postprocess.ts	Adds logic to move dependency-update bullets from Changed to Chore and refactors section parsing/assembly.
src/utils/release.ts	Uses shared bullet-prefix regex constant instead of a local regex.
src/utils/dependency-update.ts	Introduces dependency-update title detection utility.
src/utils/category-tune.ts	Applies dependency-update detection so those titles remain in Chore during tuning.
src/constants/markdown.ts	Centralizes BULLET_PREFIX_RE for reuse across utilities.
package.json	Adds @jest/globals dev dependency.
pnpm-lock.yaml	Lockfile updates reflecting new Jest-related dependency resolution.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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