fix: streaming push never sends delta+zlib — only presign path may delta
Delta bases were chosen from server commit manifests with no storage confirmation. A ghost base (in DB, absent from MinIO) caused: ❌ Push failed: delta base sha256:… not found in storage
Fix: extract build_push_objects(already_stored=). Delta encoding only fires when the base oid is in already_stored — a storage-confirmed set from the presign response. Streaming path passes already_stored=set() so all objects go as full raw objects. No more ghost-base failures.
Tests D1–D4 pin the invariant.
sha256:4f6846d439b05714369d5727ece1c4c9e7031b8565b213565de923145848623e
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sha256:8e89371155086ad60a3090512faa3b0ac5bcc2c4665060776b306b3f6c471749
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