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core/tests/fixtures/crdt/merge_fixtures.json
Shay 92ea9ee6f5 feat(vault): lock Delta-CRDT reference contract (ADR-0180 -> Accepted, gate G1) 
Establishes the canonical Delta-CRDT reference contract so a future native
(Rust/Zig) backend is gate-G1-eligible under ADR-0196 — the ZC-0 'contract
pinning' slice. No Zig code; ZC-1+ remains gated at G2.

- vault/crdt.py: canonical Python reference (ArenaEntry, Delta, LocalArena,
  merge_kernel, canonical_bytes, delta_hash). Pure content law — content-
  addressed by IEEE-754 bits then provenance; no normalization, no versor
  closure, no global Vault writes.
- ZC-0 contract tests (semilattice C-1..C-5; content ordering / signed-zero /
  NaN bit-addressing; C-7 no-global-write) — all failable (mutation-checked:
  no-dedup breaks C3/C5, arrival-order breaks C1).
- Golden fixture corpus (tests/fixtures/crdt/) regenerated deterministically
  from the reference; single source of truth also emits the Rust expected hex.
- core-rs: Delta::canonical_bytes + test_crdt_hash_parity.rs proving Rust
  produces byte-identical canonical_bytes to the Python reference.
- ADR-0180 -> Accepted: locked contract, byte layout, obligation map, and the
  explicit boundary that no Zig is authorized.

Verification: ZC-0 21 passed, Rust arena+parity 16 passed, architectural
invariants 40 passed, smoke 67 passed. Serving frozen: 7/8 lane SHAs match;
the public_demo miss is a pre-existing wall-clock budget overrun (ADR-0099,
~46-48s > 30s) reproduced identically on clean main — environmental.
2026-05-31 16:25:21 -07:00

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{
"_comment": "Golden Delta-CRDT fixture corpus (ADR-0180 / ADR-0196 gate G1). Regenerate with: uv run python tests/fixtures/crdt/_generate.py",
"versor_components": 32,
"cases": [
{
"name": "single_entry",
"description": "One delta, one entry: identity of the canonical form.",
"input_deltas": [
[
{
"versor": [
1.0,
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],
"provenance_hex": "61"
}
]
],
"expected_merged_entries": [
{
"versor": [
1.0,
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],
"provenance_hex": "61"
}
],
"expected_canonical_bytes_hex": "01000000000000000000803f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000061",
"expected_delta_hash": "e30f709c0b7b4acd6a8706c800fd78cfb6393a6ef4a5410354f8f5f4879b46a8"
},
{
"name": "dedup_within_delta",
"description": "Byte-identical entries collapse to one (join idempotence).",
"input_deltas": [
[
{
"versor": [
1.0,
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],
"provenance_hex": "61"
},
{
"versor": [
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],
"provenance_hex": "61"
}
]
],
"expected_merged_entries": [
{
"versor": [
1.0,
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],
"provenance_hex": "61"
}
],
"expected_canonical_bytes_hex": "01000000000000000000803f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000061",
"expected_delta_hash": "e30f709c0b7b4acd6a8706c800fd78cfb6393a6ef4a5410354f8f5f4879b46a8"
},
{
"name": "distinct_provenance_retained",
"description": "Same versor under different provenance are distinct content.",
"input_deltas": [
[
{
"versor": [
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"provenance_hex": "6c656674"
},
{
"versor": [
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],
"provenance_hex": "7269676874"
}
]
],
"expected_merged_entries": [
{
"versor": [
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"provenance_hex": "6c656674"
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{
"versor": [
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"provenance_hex": "7269676874"
}
],
"expected_canonical_bytes_hex": "0200000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000006c656674000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005000000000000007269676874",
"expected_delta_hash": "e58dff3847bdbc0944a7d293ba53ba4b6ea38981795f221717186c87db40b777"
},
{
"name": "three_delta_merge",
"description": "Union of three deltas, content-sorted and deduped.",
"input_deltas": [
[
{
"versor": [
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"provenance_hex": "7a"
},
{
"versor": [
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"provenance_hex": "61"
}
],
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"provenance_hex": "6d"
},
{
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"provenance_hex": "61"
}
],
[
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],
"provenance_hex": "71"
}
]
],
"expected_merged_entries": [
{
"versor": [
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"provenance_hex": "71"
},
{
"versor": [
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"provenance_hex": "6d"
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{
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],
"provenance_hex": "7a"
},
{
"versor": [
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"provenance_hex": "61"
}
],
"expected_canonical_bytes_hex": "0400000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000a040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000071000000000000000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000006d000000000000404000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000000007a0000803f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000061",
"expected_delta_hash": "82894cfb55917b33fd474f697aafbcacf86188bd83addeae999377695a19d81b"
},
{
"name": "signed_zero_distinct",
"description": "+0.0 and -0.0 have distinct bit patterns -> distinct entries.",
"input_deltas": [
[
{
"versor": [
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"provenance_hex": "70"
},
{
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],
"expected_merged_entries": [
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"provenance_hex": "70"
},
{
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}
],
"expected_canonical_bytes_hex": "020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000700000008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000070",
"expected_delta_hash": "a00e19c6a027b55a5f05e2a4f4b0c5fe82291223d3ebf6dfb639228b9f6bf553"
}
]
}
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