audit: cycle metric-vocabulary tidy — ledger records the retired #147 deferral

Cycle-close audit (architect: drift_found, design core clean). What holds,
architect-confirmed: C18 bit-identity for RunMetrics (prose derived
byte-identically, rng order preserved, registry suite unchanged); the C10
wall (monomorphic R-gates, r_based in the R vocabulary, cross-vocabulary
refusal tested both ways — no leak); C28 direction (trait in aura-analysis,
vocabulary supplied from the outer rungs, zero Cargo edge changes); C1
determinism pinned through the generic path.

Drift items, all resolved as fixes in this commit:
- design ledger: the C28 #147 disposition now records item 2 SHIPPED (the
  A1 cut) with A2 still deliberately deferred; the #136 one-implementor
  clause carries a supersession note (the IC is the second implementor).
- seven stale doc comments describing the pre-#147 or mid-cycle state
  (analysis trait + estimator docs, registry check_r_metric C9 claim,
  engine re-export note, campaign PER_MEMBER_METRICS roster note,
  member-seam guard comment, research vocabulary note) updated to the
  shipped state.
- R_BASED_METRICS is now oracle-pinned against RunMetricKey::r_based()
  in the vocabulary test (it feeds the NonRMetric refusal prose; a
  divergence would have misreported the R-gate silently).

Noted, not amended (history stays): commit 6744f67's body says 'three
syntax-only edits' where the test module actually took five.

No regression scripts are configured (the bench is report-only); the
architect review is the gate. Verification: extended vocabulary test,
campaign suites, analysis/research suites green; clippy --workspace
-D warnings clean.

refs #147

crates/aura-analysis/src/lib.rs

@@ -236,9 +236,9 @@ pub fn permute<T>(xs: &mut [T], rng: &mut SplitMix64) {
 
 /// Per-metric vocabulary a report payload supplies to the registry's
 /// ranking/deflation machinery (#147). Narrow by design (#136): exactly the
-/// surface the backtest metrics (the sole implementor so far) and the
-/// measurement IC (deflatable today via its own permutation-null path, not
-/// yet through this trait) are expected to share. The registry owns the
+/// surface the two production implementors — the backtest metrics
+/// (`RunMetrics`, centred moving-block null) and the measurement IC
+/// (within-run permutation null) — demonstrably share. The registry owns the
 /// family fold — best-of-K, p95, Laplace, dispersion floor — the payload
 /// owns what each metric IS: its name, direction, value read, and what one
 /// draw of its null statistic means.
@@ -266,9 +266,8 @@ pub trait MetricVocabulary: Sized {
 
 /// One-sided Laplace-smoothed tail estimate `(ge + 1) / (n + 1)`: the
 /// probability mass at-or-above an observed statistic given that `ge` of `n`
-/// null draws reached it. Intended as the single source of the formula the
-/// registry's R deflation arm and the CLI's IC reduction each compute inline
-/// today; wiring those call sites to this function is deferred follow-up.
+/// null draws reached it. The single source of the formula: the registry's
+/// R deflation arm and the CLI's IC reduction both call it.
 pub fn one_sided_p_laplace(ge: usize, n: usize) -> f64 {
     (ge + 1) as f64 / (n + 1) as f64
 }

crates/aura-backtest/src/metrics.rs

@@ -1389,6 +1389,22 @@ mod tests {
         assert_eq!(<RunMetrics as MetricVocabulary>::known(), RANKABLE_METRICS);
         assert!(RunMetricKey::Sqn.r_based());
         assert!(!RunMetricKey::TotalPips.r_based());
+        // Oracle-pin R_BASED_METRICS against the classification itself: the
+        // const feeds the NonRMetric refusal prose, so a divergence would
+        // misreport the R-gate silently rather than fail a lookup.
+        let derived: Vec<&str> = RANKABLE_METRICS
+            .iter()
+            .copied()
+            .filter(|n| {
+                <RunMetrics as MetricVocabulary>::resolve(n)
+                    .expect("roster names resolve")
+                    .r_based()
+            })
+            .collect();
+        assert_eq!(
+            derived, R_BASED_METRICS,
+            "R_BASED_METRICS must be exactly the r_based slice of the roster"
+        );
     }
 
     /// Property: an R-based key on a member with no `r` block ranks worst for

crates/aura-campaign/src/lib.rs

@@ -133,10 +133,11 @@ pub enum ExecFault {
 /// `RunMetrics` scalars plus the 11 `RMetrics` scalars. The three
 /// selection-annotation names (`deflated_score` / `overfit_probability` /
 /// `neighbourhood_score`) are deliberately NOT here — they describe a
-/// selection, not a member. Hand-copied roster (the third metric-roster site
-/// beside aura-research's 17-name vocabulary and aura-registry's rankable
-/// set, #190); drift fails safe: an unknown name is a preflight refusal,
-/// never a wrong number.
+/// selection, not a member. Hand-copied roster beside aura-research's 17-name
+/// vocabulary (#190); the rankable set is single-sourced from the backtest
+/// vocabulary since #147, and this roster's nesting is oracle-pinned by the
+/// extended #190 guard. Drift fails safe: an unknown name is a preflight
+/// refusal, never a wrong number.
 pub const PER_MEMBER_METRICS: &[&str] = &[
     "total_pips", "max_drawdown", "bias_sign_flips",
     "expectancy_r", "n_trades", "win_rate", "avg_win_r", "avg_loss_r",

crates/aura-campaign/tests/member_seam_e2e.rs

@@ -89,8 +89,9 @@ fn member_runner_seam_dispatches_through_dyn_trait_object_and_carries_the_window
 /// Property: every metric name in `RANKABLE_METRICS` (the roster `preflight`
 /// permits a `std::sweep`/`std::walk_forward` stage to SELECT on) is also a
 /// member of `PER_MEMBER_METRICS` and resolves to `Some` via `member_metric`.
-/// The two rosters are independently hand-copied (documented drift risk,
-/// #190); were they to diverge, `preflight` would accept a selection metric
+/// Since #147 the rankable roster is a single-source re-export and the
+/// nesting is guard-pinned; were the rosters still to diverge, `preflight`
+/// would accept a selection metric
 /// that `member_metric` silently reads back as `None` for every member — a
 /// sweep/walk_forward stage that always empties, not a compile error or an
 /// early refusal.

crates/aura-engine/src/lib.rs

@@ -76,9 +76,9 @@ pub use sweep::{
     run_indexed, sweep, GridSpace, ListSpace, ParamRange, RandomSpace, Space, SweepError,
     SweepFamily, SweepPoint,
 };
-// `resample_block`/`MetricStats` are foundation-grade (aura-analysis, #291);
-// re-exported here (unchanged exported name set) so existing
-// `aura_engine::{resample_block, MetricStats}` consumers stay source-compatible.
+// Foundation-grade aura-analysis items, re-exported so ladder rungs without a
+// direct aura-analysis edge (e.g. aura-backtest) reach them through the engine
+// (#291; the metric-vocabulary seam rides the same path, #147).
 pub use aura_analysis::{one_sided_p_laplace, resample_block, MetricStats, MetricVocabulary};
 pub use walkforward::{
     param_stability, walk_forward, RollMode, WalkForwardError, WalkForwardResult,

crates/aura-registry/src/lib.rs

@@ -793,8 +793,9 @@ pub struct Generalization {
 }
 
 /// Validate that `metric` is a known, R-based ranking key — the data-free pre-check
-/// the CLI runs before evaluating any instrument. The registry owns metric truth
-/// (C9), so the CLI never duplicates the R-set.
+/// the CLI runs before evaluating any instrument. The R classification lives in the
+/// backtest vocabulary (`RunMetricKey::r_based`, C10); this gate is the registry's
+/// monomorphic wall around it, so the CLI never duplicates the R-set.
 pub fn check_r_metric(metric: &str) -> Result<(), RegistryError> {
     let key = <RunMetrics as MetricVocabulary>::resolve(metric).ok_or_else(|| {
         RegistryError::UnknownMetric {

crates/aura-research/src/lib.rs

@@ -736,8 +736,9 @@ pub fn content_id_of(canonical: &str) -> String {
 /// (`aura-campaign/tests/metric_vocabulary_e2e.rs`, #190) also enumerates the
 /// shipped scalar fields via serde and goes red on any desync, so a stale
 /// hand-edit here is test-caught rather than silent. Keep this list in sync by
-/// hand when the upstream field sets change (single-sourcing it away waits on
-/// #147).
+/// hand when the upstream field sets change (this list stays a hand-copy by
+/// the crate's ratified core-only isolation; #147 single-sourced the rankable
+/// roster elsewhere and the extended #190 guard pins this list's nesting).
 pub fn metric_vocabulary() -> &'static [&'static str] {
     &[
         "expectancy_r",