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.

examples/node/package-lock.json

@@ -17,7 +17,7 @@
     },
     "../../bindings/node": {
       "name": "wickra",
-      "version": "0.4.6",
+      "version": "0.4.7",
       "license": "PolyForm-Noncommercial-1.0.0",
       "devDependencies": {
         "@napi-rs/cli": "^2.18.0"
@@ -26,12 +26,12 @@
         "node": ">= 18"
       },
       "optionalDependencies": {
-        "wickra-darwin-arm64": "0.4.6",
-        "wickra-darwin-x64": "0.4.6",
-        "wickra-linux-arm64-gnu": "0.4.6",
-        "wickra-linux-x64-gnu": "0.4.6",
-        "wickra-win32-arm64-msvc": "0.4.6",
-        "wickra-win32-x64-msvc": "0.4.6"
+        "wickra-darwin-arm64": "0.4.7",
+        "wickra-darwin-x64": "0.4.7",
+        "wickra-linux-arm64-gnu": "0.4.7",
+        "wickra-linux-x64-gnu": "0.4.7",
+        "wickra-win32-arm64-msvc": "0.4.7",
+        "wickra-win32-x64-msvc": "0.4.7"
       }
     },
     "node_modules/wickra": {