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.

bindings/node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "wickra",
-  "version": "0.4.6",
+  "version": "0.4.7",
   "description": "Streaming-first technical indicators: incremental, fast, install-free. Node bindings powered by Rust.",
   "author": "kingchenc <support@wickra.org>",
   "main": "index.js",
@@ -47,12 +47,12 @@
     "node": ">= 18"
   },
   "optionalDependencies": {
-    "wickra-linux-x64-gnu": "0.4.6",
-    "wickra-linux-arm64-gnu": "0.4.6",
-    "wickra-darwin-x64": "0.4.6",
-    "wickra-darwin-arm64": "0.4.6",
-    "wickra-win32-x64-msvc": "0.4.6",
-    "wickra-win32-arm64-msvc": "0.4.6"
+    "wickra-linux-x64-gnu": "0.4.7",
+    "wickra-linux-arm64-gnu": "0.4.7",
+    "wickra-darwin-x64": "0.4.7",
+    "wickra-darwin-arm64": "0.4.7",
+    "wickra-win32-x64-msvc": "0.4.7",
+    "wickra-win32-arm64-msvc": "0.4.7"
   },
   "scripts": {
     "build": "napi build --platform --release",