Cycle 0001 of the walking-skeleton milestone: the aura-core data substrate
everything streams through.
- scalar.rs: the closed four-type set — Scalar (Copy POD carrier), ScalarKind
(the kind tag), Timestamp (i64 epoch-ns newtype). No boxed Value, no dyn Any,
no heap (C7).
- column.rs: Column<T>, a fixed-capacity bounded-lookback ring pre-sized at
construction (no hot-loop realloc, C8), financial-indexed (index 0 = newest),
carrying a monotonic run_count freshness primitive (C5). Window<'_,T> is its
zero-copy read view with newest-at-0 Index. No RefCell/Rc — a sim is
single-threaded (C1), so push is &mut and read is &.
- any.rs: AnyColumn, the type-erased edge over the four Column kinds. push()
kind-checks at the edge (wiring time) and rejects a wrong-kind value with
KindMismatch, leaving the column untouched; the hot path bypasses the check
via the monomorphic as_*_mut accessors (C7).
- error.rs: KindMismatch { expected, got }, the guard error.
Sharpens the RustAst rtl/ reference (VecDeque + RefCell + boxed Value) into a
fixed ring of Copy scalars with direct dispatch. Node trait, Ctx, firing
policies, and the sim loop are deferred to subsequent cycles.
Verified independently: cargo build --workspace (0 warnings), cargo test
--workspace (14 aura-core tests green incl. ring-wrap, run_count monotonicity,
zero-copy window, and the wrong_kind_push_is_rejected guard), cargo clippy
--workspace --all-targets -D warnings (clean), and a surface-purity grep
confirming no RefCell/Rc/dyn Any on the substrate.
refs #0001-core-streaming-substrate
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Anchor the implementation-design branch: C19 (construction is a bootstrap phase — param-generic blueprint -> frozen instance; recursive up to the harness; params size/configure but never change topology). C20 (strategy = reusable context-free composite blueprint with role inputs + position-event output; harness = the root sim graph and C1's disjoint unit, with structural axes = experiment matrix vs tuning params = sweep; both strategy AND experiment authored in Rust via builder APIs, not a config DSL). Extend C8 (schema declares tunable params+ranges), C16 (a project is a Rust crate: cdylib of node/strategy/experiment blueprints + static Aura.toml; hosted by aura during research, frozen to a binary for deploy), C17 (all logic is Rust — nodes/strategies/experiments; Aura.toml = static context only), C12 (frozen topology = a harness instance; structural matrix is the outer axis). Add CLAUDE.md invariant 11; refresh project-layout.md (experiments/ dir, Rust experiments, day-in-the-life).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Correct the broker mechanism: a broker is an ordinary downstream consumer node (C8/C9), not an external plugin/subsystem. It consumes the position-event stream + price streams and emits an equity stream; several brokers (e.g. sim-optimal pip + realistic currency) can be attached to the same position table at once, yielding directly comparable equity curves. Updates C10, CLAUDE.md invariant 7, aura-engine/aura-std crate docs, and the day-in-the-life doc.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
C8: a node is producer/consumer/both — at most one output, pure consumers (sinks: chart/equity/logger) have none; records the node-role taxonomy the substrate requires (was wrongly 'exactly one output', contradicting pure consumers and C14). C3: merge by timestamp, normalizing source-native units (data-server Unix-ms) to the canonical epoch-ns of C7. aura-engine lib doc: broker is a downstream plugin over the position table (sim-optimal pip / realistic currency), not an in-strategy 'broker/portfolio node'. Plus a provenance line-wrap nit.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Refine the structure per interview: aura is the reusable engine, research projects are separate external repos depending on it (C16). Add aura-std (universal standard-node tier) to the workspace; remove nodes/ from the engine (project concept). Record authoring-surface = Claude Code + skills pipeline, no embedded coding-LLM (C17), and project management = one-repo-one-project + Aura-native run registry (C18). Add CLAUDE.md invariants 9-10, code_roots -> [crates], and docs/project-layout.md documenting the day-in-the-life and project repo layout.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Cargo workspace aura-core -> aura-engine -> aura-cli (bin `aura`) plus nodes/ for hot-reloadable cdylib node crates. Crate bodies are intentionally API-free; types arrive from the first spec. Adds the skills profile (.claude/dev-cycle-profile.yml), the project CLAUDE.md with the eight domain invariants, and the design-ledger skeleton.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Brummel