docs(core): define hermetic build kernel - #45
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Depends on #44.
What does this change?
This PR documents Bessemer's hermetic build kernel.
The model contains three parts:
The document explains how immutable version sets compose with the content-addressed store and action cache. An action key includes only the reachable dependency closure. An unrelated package update does not invalidate the action.
The document also defines the hermeticity boundary, complexity properties, and direction for tenant-safe cache reuse. Similarity hashes can select candidates. They cannot authorize a cache hit.
How was it tested?
pnpm run ci testpassed 33 tests.cargo build --locked --bin bsmr.git diff --check feat/version-set-identity..docs/hermetic-build-core.Reviewed rendered links and Markdown structure locally.
CLA/Vouch check passes, or this PR only updates
VOUCHED.td.