[kernel-869] exclude files from extensions

[archandatta]

Note

Medium Risk
Moderate risk because it changes the core ZipDirectory API and behavior (new filtering + walker error handling), which affects deployment and extension uploads and could unintentionally omit required files or alter zip contents.

Overview
Extension uploads now produce smaller, safer bundles. extensions upload zips directories with default exclusions (e.g., node_modules, .git, test/spec files, logs) and enforces a 50MB max bundle size, printing the resulting archive size and actionable guidance when exceeded.

Zipping API updated across the CLI. util.ZipDirectory now accepts optional ZipOptions for directory and filename-pattern exclusions and propagates directory-walk errors; all call sites (deploy, browsers extensions upload, etc.) are updated to pass nil or the new default options. Adds util.FormatBytes and new tests for zip exclusions and unzip behavior.

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[rgarcia]

thanks for the pr! left some comments on naming, code duplication, and making the util more generic. main concerns are around duplicating the existing ZipDirectory function and making the exclusion options more intuitive.