publish:commit fails with error.BufferTooSmall

Description

pantry publish:commit '.' fails with error.BufferTooSmall when publishing the ts-watches package from stacksjs/ts-watches.

Steps to Reproduce

1. Push to main on stacksjs/ts-watches
2. CI runs pantry publish:commit '.'
3. Pantry finds the package, scans ignore files, then fails

Error Output

Publishing ts-watches...
  Scanning for ignore files in: /home/runner/work/ts-watches/ts-watches/.
    Checking: /home/runner/work/ts-watches/ts-watches/./.pantryignore
  Using .pantryignore for exclusions (347 bytes)
    + exclude: packages/ts-watches/bin/watch
    + exclude: .cache
    ...
  ✗ Failed: error.BufferTooSmall

Context

• The package has "files": ["README.md", "dist"] in package.json, so it should use the explicit files path (not rsync/default)
• The dist directory is only 516K with 41 files
• All file paths are under 60 characters
• Previously failed with Tarball exceeds maximum size of 50MB (before adding .pantryignore to exclude a 58MB compiled binary), then started failing with this different error after the size issue was resolved

Likely Source

Based on reading the Zig source, the error.BufferTooSmall likely comes from either:

• The redirect_buf: [8192]u8 in uploadCommitViaHttp() during HTTP redirect handling
• The multipart body buffer construction in uploadCommitViaHttp() if the pre-allocated buffer size calculation is off
• Possibly std.http.Client.fetch() internals when processing the server response

Environment

• GitHub Actions (ubuntu-latest)
• Pantry Action: home-lang/pantry/packages/action@main
• Package: ts-watches v0.1.0