release: bump 0.5.9 -> 0.6.0 (#190)

Version bump for the **v0.6.0** release (ships the B5 Volatility & Bands batch, #189 — 423 -> 429 indicators).

Bumps version strings across Cargo workspace, pyproject, node package.json + 6 platform packages, both package-lock.json files, and Cargo.lock; CHANGELOG `[Unreleased]` -> `[0.6.0]`. No code changes.

Versioning note: patch never reaches two digits — `0.5.9` rolls to the next minor `0.6.0` (not 0.5.10).

bindings/node/package.json

@@ -1,6 +1,6 @@
 {
   "name": "wickra",
-  "version": "0.5.9",
+  "version": "0.6.0",
   "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": "0.5.9",
-    "wickra-linux-arm64-gnu": "0.5.9",
-    "wickra-darwin-x64": "0.5.9",
-    "wickra-darwin-arm64": "0.5.9",
-    "wickra-win32-x64-msvc": "0.5.9",
-    "wickra-win32-arm64-msvc": "0.5.9"
+    "wickra-linux-x64-gnu": "0.6.0",
+    "wickra-linux-arm64-gnu": "0.6.0",
+    "wickra-darwin-x64": "0.6.0",
+    "wickra-darwin-arm64": "0.6.0",
+    "wickra-win32-x64-msvc": "0.6.0",
+    "wickra-win32-arm64-msvc": "0.6.0"
   },
   "scripts": {
     "build": "napi build --platform --release",