fix: parse binary rename diff stats

[liyimil]

What changed

• parse binary diff-stat entries that omit before/after byte counts
• retain the renamed path and mark the entry as binary with zero byte counts
• add regression coverage for a binary rename summary
• add a patch changeset

Why

Git emits binary renames as path | Bin, without the before -> after bytes section. The existing parser only recognizes the sized form, leaving DiffSummary.files empty for renames.

Fixes #885.

Checks

• yarn workspace simple-git jest --runInBand test/unit/diff.spec.ts (23 tests passed)
• yarn tsc -p simple-git/tsconfig.release.json --noEmit
• Biome check for all changed files
• git diff --check

Prepared with Codex assistance; the diff was reviewed and the checks above were run locally.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8a9f22c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
simple-git	Patch

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[steveukx]

Hi, please can you add an integration test to this PR along with the unit test. Thanks