fix(tar-parser): fix for large repos

[remorses]

Summary

Fix tar-parser failing to parse large tar files due to edge case in buffer boundary handling.

Problem

The tar-parser was failing when parsing large tar files. The issue occurred in the #parseBody() method where the parser wasn't properly handling the case when a file's content ended exactly at a buffer boundary.

Solution

This PR addresses the edge case to ensure proper parsing of tar files regardless of size or how file contents align with buffer boundaries.

[Copilot]

Pull Request Overview

Fixes a critical bug in the tar-parser that caused failures when parsing large tar files due to improper buffer boundary handling in the parseBody() method.

• Adds proper handling for when file content ends exactly at a buffer boundary
• Ensures the body controller is properly closed and reset when file reading is complete
• Includes test coverage with a real-world large repository to validate the fix

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/tar-parser/src/lib/tar.ts	Fixes buffer boundary edge case by adding completion check and proper cleanup when #missing reaches zero
packages/tar-parser/src/lib/tar.test.ts	Adds integration test using a large GitHub repository to verify the fix works with real-world large tar files

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[remorses]

@mjackson