sx-git extension: git-wire export adapter — byte-exact loose objects + SHA-1 (TDD)
lib/git/sha1.sx: SHA-1 in pure SX over host bitwise prims (FIPS vectors +
multi-block verified). lib/git/export.sx: native objects -> git payloads
"<type> <len>\0<body>" with real git identity, golden-verified against git
CLI (hash-object/mktree/commit-tree/mktag with pinned idents): tree entry
sorting with dirs keyed "name/", raw 20-byte child shas, "40000" subtree
mode, :mode overrides, deterministic ident defaults, trailing-newline
message rule. export-closure/export-set emit a host-writable object table.
Adapter-at-the-edge: native model untouched; zlib/packfiles remain host-side
concerns. 25/25, total 252/252.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
giles
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