feat(core): add canonical version-set identity - #44
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Depends on #43.
What does this change?
This PR adds the typed identity for an immutable dependency version set.
An ecosystem adapter supplies the root record for a canonical Merkle directed acyclic graph. Bessemer hashes the exact content-addressed object with the repository's configured digest algorithm. Cryptographic domain separation keeps a version-set identity distinct from other content digests.
The type system prevents code from using an arbitrary content digest as a version-set identity. Golden tests fix the serialized format. Mutation tests verify that a semantic input change produces a different identity.
This PR adds only the identity type. Lockfile import, selected dependency closures, and package materialization remain separate RFC 0001 milestones.
How was it tested?
cargo test --locked -p bsmr_common version_setpassed two tests.cargo build --locked --bin bsmr.pnpm run ci testpassed 33 tests.git diff --check origin/feat/pnpm-adapter-m0..feat/version-set-identity.CLA/Vouch check passes, or this PR only updates
VOUCHED.td.