release: bump 0.4.6 -> 0.4.7 (#156)

Routine patch release. Ships the 10 pairwise stat-arb indicators added to Price Statistics in #154 (Rolling Correlation, Rolling Covariance, OU Half-Life, Kalman Hedge Ratio, Variance Ratio, Spread Bollinger Bands, Spread Hurst, Distance SSD, Granger Causality, Beta-Neutral Spread) together with the new Market Breadth family and its `CrossSection` input type (AdvanceDecline).

Version strings bumped `0.4.6 -> 0.4.7` across:
- `Cargo.toml` (workspace + `wickra-core` dep), `Cargo.lock`
- `bindings/python/pyproject.toml`
- `bindings/node/package.json` (+ 6 optional platform deps) and the 6 `npm/<platform>/package.json`
- `bindings/node/package-lock.json`, `examples/node/package-lock.json`
- `CHANGELOG.md` — `[Unreleased]` rolled into `[0.4.7] - 2026-06-03` with refreshed compare links

No code changes. `fmt` / `test --workspace` / `clippy --workspace -D warnings` green locally.

Cargo.lock

@@ -1867,7 +1867,7 @@ dependencies = [
 
 [[package]]
 name = "wickra"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "approx",
  "criterion",
@@ -1878,7 +1878,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-core"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "approx",
  "proptest",
@@ -1888,7 +1888,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-data"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "approx",
  "csv",
@@ -1915,7 +1915,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-node"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "napi",
  "napi-build",
@@ -1925,7 +1925,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-python"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "numpy",
  "pyo3",
@@ -1934,7 +1934,7 @@ dependencies = [
 
 [[package]]
 name = "wickra-wasm"
-version = "0.4.6"
+version = "0.4.7"
 dependencies = [
  "console_error_panic_hook",
  "js-sys",