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

docs/glossary.md

@@ -93,7 +93,7 @@ The set of harness instances produced by varying the structural axes (strategy
 
 ### exposure stream
 **Avoid:** — (superseded)
-**Superseded by `bias` (2026-06 R-reframe).** The pre-reframe primary output: a signed, bounded `f64 ∈ [-1,+1]` per cycle read as the desired fractional *position* (conflating direction + conviction + size). Reframed to `bias` (unsized direction + conviction), sizing moved downstream to the `Sizer`/`RiskExecutor`; the term and the `Exposure` node persist in pre-reframe code until the Stage-1 rename.
+**Superseded by `bias` (2026-06 R-reframe).** The pre-reframe primary output: a signed, bounded `f64 ∈ [-1,+1]` per cycle read as the desired fractional *position* (conflating direction + conviction + size). Reframed to `bias` (unsized direction + conviction), sizing moved downstream to the `Sizer`/`RiskExecutor`; the term and the `Exposure` node persisted in pre-reframe code until the r-family rename (#174).
 
 ### firing policy
 **Avoid:** —
@@ -249,7 +249,7 @@ System Quality Number — `√n · mean_R / stdev_R`: the dispersion- and trade-
 
 ### Stage 1 / Stage 2
 **Avoid:** — (superseded)
-**Superseded (2026-06-28 C10 reframe): there is no Stage-2 currency/compounding gate.** Research is one pure feed-forward R loop — gross R → net R via the `cost model` — with money, compounding, and a real broker living only at a separate later **live / deploy edge** (compounding is a post-hoc money-management transform of the net-R sequence, not an in-loop axis). The pre-reframe cleave gated a Stage-2 currency / fixed-fractional / realistic-broker layer behind `E[R] > 0`; **"Stage-1"** now survives only as a historical cycle / identifier name for the shipped feed-forward R chain, not one half of a two-stage gate.
+**Superseded (2026-06-28 C10 reframe): there is no Stage-2 currency/compounding gate.** Research is one pure feed-forward R loop — gross R → net R via the `cost model` — with money, compounding, and a real broker living only at a separate later **live / deploy edge** (compounding is a post-hoc money-management transform of the net-R sequence, not an in-loop axis). The pre-reframe cleave gated a Stage-2 currency / fixed-fractional / realistic-broker layer behind `E[R] > 0`; **"Stage-1"** now survives only as a historical cycle name — the shipped feed-forward R chain's identifier family was renamed to the r-family (`r-sma` / `r-breakout` / `r-meanrev`, #174) — not one half of a two-stage gate.
 
 ### strategy
 **Avoid:** —