Cycle B of milestone "The World — parameter-space & sweep". A blueprint is now
value-empty: a leaf holds a param-generic recipe, not a built node, and a positional
Scalar vector is bound slot-by-slot at bootstrap — so one blueprint bootstraps into
many distinct instances under different vectors, with no cdylib rebuild (C12/C19).
This is the binding primitive a sweep (#32) drives.
Ratified design (brainstorm): value-empty reconstruct-through-new() over
mutate-in-place and over a default-bearing variant. The value lives only in the
injected vector (no baked default), keeping the blueprint a pure param-generic
recipe (C19); every injected value flows through the node's own constructor (the
single sizing/validation gate).
- aura-core: LeafFactory { name, params, build } — the recipe (params -> sized node
through `new`); Scalar::as_i64/as_f64 value accessors. Node trait unchanged.
- aura-std: each of the 7 nodes exposes factory() (SMA length:I64, Exposure
scale:F64, LinComb arity x weights[i]:F64; Sub/Add/SimBroker/Recorder paramless,
capturing their non-param construction args — pip_size, the Recorder channel).
- aura-engine: BlueprintNode::Leaf(LeafFactory), From<LeafFactory>; param_space()
reads factory.params() pre-build; compile_with_params/bootstrap_with_params build
each leaf from its kind-checked slice while lowering (build-then-wire), arity
checked up front via param_space().len(); CompileError::{ParamKindMismatch,
ParamArity}. compile/inline/edge-rewrite are structurally unchanged, so the
compilat stays bit-identical for a given point (the bit-identity and both
param_space mirror tests stay green). The vestigial pre-build Composite::schema /
BlueprintNode::schema (no live caller — interface resolution is structural on the
built flat nodes) are removed.
- aura-cli: the blueprint view labels leaves by bare type via LeafFactory::label()
(`[SMA]`) — the ascii-dag renderer cannot render wide cluster-sibling labels (see
spec); the compiled view still labels valued (`SMA(2)`). The sample supplies its
point as a vector; the mis-wiring swap moved to the compiled view.
The #34 dual-traversal drift hazard is subsumed: compile_with_params consumes the
vector in the same recipe walk param_space() reports, so the two share one
traversal.
Verified: cargo build/test --workspace green (127 tests, incl. bit-identity, both
mirror tests, and 4 new injection tests — different-vector-different-run, kind
mismatch, arity, determinism); clippy --workspace --all-targets -D warnings clean;
`aura graph` blueprint view renders cleanly.
Scope: one vector -> one instance. Deferred: sweep enumeration (#32), domain
validation (#32/C20), single-run authoring convenience (#35).
closes#31
Brummel
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