Cut 8, Huginn half, commit 3 of 4: `admission.rs`. `Mind::admit`
prepares typed documents through the leaf and calls `admit_prepared`,
the single commit path for this cut, Cut 10's sink, Cut 12's hand-off and
import, and Cut 13's tools. The steps run in order and the first failing
step is the outcome: the batch names this mind (A1), one to sixty-four
envelopes (A2), the leaf's bounds, formats and key recomputation (A3),
unique identities (A4), every instance-carrying document names this mind
(A5), an empty mind's first batch carries exactly one `instance` document
and a batch carrying one derives the epoch record (A6), every reference
resolves in image or batch by `(kind, id)` (A7), the derived writes pass
A3-A7 themselves, the per-kind rules and the resolution matrix (A8), an
exact replay answers with the stored receipt only after validation (A9),
no write collides with the image (A10), the commit (A11).
Derived writes: a ruling that answers derives the `Answered` resolution
of its question; a hand-off derives the stewardship withdrawal on its
source side and the stewardship assignment on its receiving side. "In
force" is computed at rule time from the resolutions in image and batch
and never stored; the two derivations are the only resolutions a rule
ignores when judging its own document.
Two places the leaf is thinner than the spec assumed. `FindingWithoutRange`
is unreachable: a finding envelope without `range` fails the leaf's decode
as `Document(InvalidFormat { field: "payload" })` before any organ rule,
and the test asserts that. A campaign with no repos has no refusal of its
own in the spec's list; it is refused as `Document(FieldBound)` on
`campaign.repos` with a minimum of one. `PipelineAdmissionBatch` cannot
derive `JsonSchema` because the leaf's `PipelineDocument` does not; the
outcome and refusal types do.
The epoch record is derived whenever the batch carries the `instance`
document, which only the first batch may, so a replay of the first batch
digests to the same receipt and answers `AlreadyAdmitted` instead of
colliding.
Tests: 26 (the spec's 25 plus the replay-planting test, the receipt's
deliberate second construction site). `cargo check -p huginn-mind --lib
--tests` and `cargo test -p huginn-mind --lib` pass with zero warnings;
`cargo check --workspace` passes. README says what the crate does now.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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