github-integrate: Pack Assembly & Lazy CAS Blob Synchronization (Phase 3)

[kavix]

Goal

Synchronize compressed CAS object files (.eko/objects/) efficiently by packaging and uploading them on-demand.

Steps to Outcome

1. Blob Packaging (TAR.GZ Pack):
   • Identify local CAS object files referenced by new manifests.
   • Compress and bundle these objects into a single .eko_pack.tar.gz archive.
2. Remote Pack Storage (Release Assets / Packages):
   • Upload the package archive using the GitHub Releases API (as a release asset) or GitHub Container Registry (as generic OCI artifacts).
3. Lazy Object Download on eko restore:
   • When a user triggers eko restore <id>, inspect the local cache first.
   • If object blobs are missing, download the corresponding remote pack archive from GitHub and extract it into .eko/objects/.
4. Progress and Performance UX:
   • Show a real-time progress bar (using github.com/schollz/progressbar) during upload and download phases.

Final Outcome

Eko packages and uploads object blobs to GitHub during push, and downloads missing blobs lazily on-demand during restoration.