test: share cross-binding encoding vectors

[0xgleb]

Add one root-owned deterministic-CBOR byte corpus, consume it from both Rust and Haskell codec tests, and make it an explicit input to both Nix source derivations.

Closes #78.

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This is part 24 of 32 in a stack made with GitButler:

•  32  feat: reconcile Haskell aggregate schemas #52
•  31  docs: reserve TypeScript bindings for 0.5.0 #51
•  30  test: property-check protocol invariants #49
•  29  test: discover Haskell specs with Hspec #48
•  28  refactor: use the Event.Sorcery module namespace #47
•  27  feat: expose schema recovery over the C ABI #46
•  26  refactor: expose schema recovery through engine facade #45
•  25  bench: add Haskell engine benchmarks #43
•  24  test: share cross-binding encoding vectors #42 👈
•  23  feat: renew Haskell job leases #41
•  22  feat: deliver Haskell dispatch verdicts #40
•  21  feat: settle Haskell job executions #39
•  20  feat: route Haskell job executions #38
•  19  feat: seal Haskell dispatch outcomes #37
•  18  feat: load Haskell entities from snapshots #36
•  17  feat: execute typed Haskell commands #35
•  16  feat: restore the typed Haskell domain model #34
•  15  feat: run jobs from the Haskell binding #33
•  14  refactor: package the Haskell binding by feature #32
•  13  feat: expose job operations over the C ABI #31
•  12  feat: expose the existing job runtime #30
•  11  feat: call the shared engine from Haskell #29
•  10  feat: add deterministic Haskell engine codecs #28
•  9  feat: expose stream operations over the C ABI #27
•  8  feat: add the C ABI lifecycle #26
•  7  api: expose the shared engine facade #25
•  6  refactor: route job storage through the engine facade #24
•  5  refactor: extract the serialized engine facade #23
•  4  test: pin atomic event and job persistence #22
•  3  chore: update 0.4.0 ownership metadata #18
•  2  build: unify the Rust and Haskell toolchain #17
•  1  docs: specify the 0.4.0 monorepo engine #14

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