First-class support for elastic-git-storage as a custom LFS transfer
agent. When lfsTransferAgent is set to "elastic-git-storage" (or
"elastic-git-storage@v1.0.0" for a specific version), the service
automatically finds or installs the agent from GitHub releases, then
configures it via git config.
Supports version pinning via @version suffix in the agent value,
eliminating the need for a separate version parameter. Platform and
architecture detection handles linux/darwin/windows on amd64/arm64.
37 unit tests covering detection, PATH lookup, installation, version
parsing, and configuration delegation.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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