Iteration-2 plan for cycle 0065 (Stage-1 R signal quality). Sub-splits the
spec's iteration 2: this plan is the node + metric layer; the CLI/recording
surface (#129) becomes a separate iteration 3.
Five tasks, sequenced so each signature change threads all its callers before
its build gate, and the two signature changes land before the composite that
consumes both:
1. PositionManagement gains a 4th `size` input (col 10, from the Sizer); R
stays size-INVARIANT (RED test pins it). Threads the PM unit tests + the
stage1_r_e2e direct-eval column setups.
2. Sizer node (aura-std): `size = risk_budget / stop_distance`, flat-1R; the
Stage-2 fixed-fractional seam slots in unchanged.
3. summarize_r enrichment: SQN, conviction terciles, net-of-cost; gains a
`round_trip_cost` param (reads dense cols 6/7/9). Threads report.rs + the
E2E callers and extends the cross-crate layout guard.
4. RunMetrics.r: Option<RMetrics> with serde(default, skip_serializing_if) for
legacy runs.jsonl back-compat. Threads every RunMetrics literal (report.rs,
aura-registry, aura-engine/mc).
5. RiskExecutor composite (aura-engine integration-test fixture, sibling of
vol_stop_composite): FixedStop -> Sizer -> PositionManagement behind open
bias+price roles, price fanned to both; bias produced in-graph (single
source, no stale-price two-cycle merge). Veto is a documented seam, not a
node. E2E equivalence + R-invariance under risk_budget.
refs #117
Brummel
6e214957d1