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o Proxy remote asset and remote execution requests via buildbox-casd (1922, 1926)
o Optimize bst show when no cached state is needed (1923)
o Support %{description} in bst show commands
o Support HTTP Bearer authentication for remote API servers (1925)
o Drop support for Python 3.7 (1933, 1934, 1936)
o downloadablefilesource: Add 10 minutes timeout (1928)
o tar.py: Always check member paths (1932)
o Ensure blobs are available locally when using storage-service (1938)
o Support loading source mirror plugins from pip and junction origins (1931)
o Restore terminal after exiting a bst shell (1786)
o Fail early if buildbox-run is present but non-functional (1746)
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