rename: retire the stage1-* family for the r-family (r-sma / r-breakout / r-meanrev)

The stage1 ordinal has been dead vocabulary since the C10 reframe dropped
the two-stage research model: a 1 structurally implies a 2 that no longer
exists. The family is renamed by its live discriminator - the R yardstick -
with members named by their signal, uniform with their signal-named
siblings (sma, macd, momentum):

- selectors: stage1-r -> r-sma, stage1-breakout -> r-breakout,
  stage1-meanrev -> r-meanrev (old tokens are usage errors, exit 2 - no
  silent alias)
- identifiers: Strategy::RSma/RBreakout/RMeanRev, HarnessKind::RSma,
  r_sma_*/r_breakout_*/r_meanrev_*, wrap_r, run_signal_r, RGrid, R_SMA_*
- persisted identity: the sma_signal composite (param prefix
  sma_signal.fast.length / .slow.length; fixtures regenerated; content-ids
  shift - no test pins a literal hash, the registry parses no record names)
- e2e test files git-mv'd to r_sma_e2e / r_breakout_e2e / r_meanrev_e2e
- dead Stage-1/Stage-2 prose reworded to post-C10 vocabulary across
  rustdoc, Cargo.tomls, ledger live lines, and the glossary (historical
  entries stay; fieldtests corpus untouched)
- CLAUDE.md invariant 7 rewritten to record the ratified C10 reframe
  faithfully (the token-swap alone would have laundered the retired
  gated-currency/realistic-broker design into unmarked live prose); the
  unbacked account-mode clause dropped

Verification: cargo build/test --workspace green (51 targets), clippy
-D warnings clean, doc build clean, acceptance grep gate leaves exactly
the one resampling-stage false positive (harness.rs), smoke: --harness
r-sma runs, --harness stage1-r exits 2 with the new usage line.

Decision log: forks and rationale recorded on the issue (reconciliation
+ implementation-phase comments).

closes #174

crates/aura-std/src/position_management.rs

@@ -1,4 +1,4 @@
-//! `PositionManagement` — the stateful heart of Stage-1 risk-based execution. Turns a
+//! `PositionManagement` — the stateful heart of feed-forward risk-based execution. Turns a
 //! bias + a protective-stop distance into a stream of realised per-trade R-outcomes.
 //! Emits ONE dense record per cycle (C8, like `SimBroker`; multi-field output on the
 //! `Resample` precedent): the trade ledger is the rows where `closed_this_cycle`, the
@@ -146,7 +146,7 @@ impl Node for PositionManagement {
                 } else {
                     price.max(p.stop_level)
                 };
-                // size-invariant: R is a pure stop-distance ratio (Stage-1 feed-forward).
+                // size-invariant: R is a pure stop-distance ratio (feed-forward).
                 realized = p.dir as f64 * (fill - p.entry) / p.latched_dist;
                 was_stopped = true;
                 reason = ExitReason::Stop as i64;
@@ -157,7 +157,7 @@ impl Node for PositionManagement {
                 closed = true;
                 self.pos = None;
             } else if bias_exit {
-                // size-invariant: R is a pure stop-distance ratio (Stage-1 feed-forward).
+                // size-invariant: R is a pure stop-distance ratio (feed-forward).
                 realized = p.dir as f64 * (price - p.entry) / p.latched_dist;
                 reason = if sign0(bias) != 0.0 {
                     ExitReason::ReversalLeg as i64
@@ -275,7 +275,7 @@ mod tests {
     }
 
     // (3) R-invariance under size: the Sizer's `size` flows into col 10 but never into R.
-    // Scaling size leaves every realized_r identical (the property that keeps Stage 1
+    // Scaling size leaves every realized_r identical (the property that keeps the research loop
     // feed-forward); col 10 reflects the size so we know it actually flowed end-to-end.
     #[test]
     fn realized_r_is_invariant_under_size() {

crates/aura-std/src/sizer.rs

@@ -1,11 +1,11 @@
-//! `Sizer` — the flat-1R sizing seam (C10 Stage-1). Turns a protective-stop distance
+//! `Sizer` — the flat-1R sizing seam (C10). Turns a protective-stop distance
 //! into a position `size = risk_budget / stop_distance`: with `risk_budget = 1.0` this is
 //! true flat-1R (one risk unit per trade) and `size` is inversely proportional to the
 //! stop — NOT a constant. The `bias` input gates firing (a size is only meaningful when a
-//! strategy is taking a position) and is the Stage-2 seam: fixed-fractional sizing swaps
-//! `risk_budget` for `risk_fraction · equity` (an added equity input), same node shape.
-//! R is computed SIZE-INVARIANTLY downstream, so the Sizer never contaminates signal
-//! quality — it only scales the (Stage-2) currency exposure.
+//! strategy is taking a position) and is the live/deploy-edge seam: fixed-fractional
+//! sizing swaps `risk_budget` for `risk_fraction · equity` (an added equity input), same
+//! node shape. R is computed SIZE-INVARIANTLY downstream, so the Sizer never contaminates
+//! signal quality — it only scales the (deploy-edge) currency exposure.
 use aura_core::{
     Cell, Ctx, FieldSpec, Firing, Node, NodeSchema, ParamSpec, PortSpec, PrimitiveBuilder,
     ScalarKind,