C29 compile/unit seam, tasks 4+5 of the self-description plan.
aura-engine (task 4): derive_signature stamps doc: "" with the stance
recorded in-code -- a derived composite signature is graph wiring, not
a vocabulary entry; no seam walks its doc, the described surface is the
composite's own doc at the register seam. All in-crate test literals
thread doc: "test-only schema".
Domain crates (task 5): the 12 production builder sites in
aura-market / aura-strategy / aura-backtest carry authored meaning
lines; test sites in aura-backtest / aura-composites / aura-ingest
thread the test-only doc.
Three texts were corrected against the actual node semantics after
quality review rather than kept from the first authoring pass:
SimBroker is the frictionless integrator of held exposure times price
return into cumulative pip equity (no fills/stops/lifecycle -- that is
PositionManagement's domain), the shared cost-node line names the
PM-geometry inputs and both charge modes (AtClose / PerHeldCycle)
instead of a "per-trade gross R" mapping, and LongOnly's line
conditions on its enabled param and speaks port-term "exposure".
Gates: cargo test green for all six touched crates (engine, market,
strategy, backtest, composites, ingest); the workspace-wide gate
follows task 6 (aura-runner is the one remaining unthreaded site,
E0063 by design until then).
refs #316
The run-mode-aware bind seam. bind_tap attaches a CALLER-BUILT Box<dyn Node>
sink to a declared tap — appending the sink node + an edge from the tap's
(node, field) to its input, before bootstrap so the Kahn sort orders it. The
engine constructs no aura-std type (it takes a Box<dyn Node>), keeping its
production dependency aura-core-only. bind_tap raises UndeclaredTap; duplicate
detection across binds is the caller's (the engine keeps no cross-call state),
mirroring how bind_sources' DuplicateFeed is a supply-level fault. TapBindError
is exported for the CLI. A bound tap records exactly the producer's per-cycle
output through the full public pipeline; an undeclared name is refused without
mutating the graph.
refs #282
claude