release: bump 0.5.0 -> 0.5.1 (#162)

Version bump **0.5.0 → 0.5.1** for the Seasonality & Session family release (12 indicators, PR #161).

Bumped: `Cargo.toml` (workspace version + `wickra-core` dep), `Cargo.lock` (via `cargo build`), `bindings/python/pyproject.toml`, `bindings/node/package.json` (+ 6 `optionalDependencies`), the 6 `bindings/node/npm/<platform>/package.json`, both `package-lock.json` files, and `CHANGELOG.md` (`[Unreleased]` → `[0.5.1]` + compare URLs).

No code changes — version strings only.

examples/node/package-lock.json

@@ -17,7 +17,7 @@
     },
     "../../bindings/node": {
       "name": "wickra",
-      "version": "0.5.0",
+      "version": "0.5.1",
       "license": "MIT OR Apache-2.0",
       "devDependencies": {
         "@napi-rs/cli": "^2.18.0"
@@ -26,12 +26,12 @@
         "node": ">= 18"
       },
       "optionalDependencies": {
-        "wickra-darwin-arm64": "0.5.0",
-        "wickra-darwin-x64": "0.5.0",
-        "wickra-linux-arm64-gnu": "0.5.0",
-        "wickra-linux-x64-gnu": "0.5.0",
-        "wickra-win32-arm64-msvc": "0.5.0",
-        "wickra-win32-x64-msvc": "0.5.0"
+        "wickra-darwin-arm64": "0.5.1",
+        "wickra-darwin-x64": "0.5.1",
+        "wickra-linux-arm64-gnu": "0.5.1",
+        "wickra-linux-x64-gnu": "0.5.1",
+        "wickra-win32-arm64-msvc": "0.5.1",
+        "wickra-win32-x64-msvc": "0.5.1"
       }
     },
     "node_modules/wickra": {