fix: restore build and tests under TypeScript 6

The dependency bumps on main left `npm test` and `npm run build:types`
broken independently of any feature work; both fail on a clean checkout
of origin/main.

TypeScript 6 no longer auto-includes @types packages the way node10
resolution did, so every test suite failed to compile with "Cannot find
name 'describe'/'expect'". Declare the needed @types explicitly instead:
  - tsconfig.json: types: ["node"]
  - jest.config.js: types: ["jest", "node"]

TypeScript 6 also errors on two settings this config relied on:
  - moduleResolution "node" (node10) is deprecated -> "bundler", which
    matches how the package is actually consumed (rollup-bundled, with
    "module": "ESNext")
  - an implicit rootDir is now an error when outDir/declarationDir are
    set -> rootDir: "./src"

Drop three unused imports that noUnusedLocals turns into hard errors,
failing --emitDeclarationOnly.

Finally, NodeSecureMemory logged to stdout unconditionally on
construction. This was dormant while the native addon failed to load;
once it loads, it broke the "no console.log when debug=false" test. A
library must not write to stdout uninvited, and the client already
reports this via getProtectionInfo() behind its own debug flag.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/core/crypto/encryption.ts

@@ -3,7 +3,7 @@
  * Matches the Python implementation using AES-256-GCM with random nonces
  */
 
-import { getCrypto, arrayBufferToBase64, base64ToArrayBuffer, generateRandomBytes } from './utils';
+import { getCrypto, generateRandomBytes } from './utils';
 
 export class AESEncryption {
     private subtle: SubtleCrypto;

src/core/crypto/rsa.ts

@@ -3,7 +3,7 @@
  * Matches the Python implementation using RSA-OAEP with SHA-256
  */
 
-import { getCrypto, pemToArrayBuffer, arrayBufferToPem, stringToArrayBuffer, arrayBufferToString, generateRandomBytes } from './utils';
+import { getCrypto, pemToArrayBuffer, arrayBufferToPem, stringToArrayBuffer, generateRandomBytes } from './utils';
 import { SecureByteContext } from '../memory/secure';
 
 export class RSAOperations {

src/core/memory/node.ts

@@ -37,10 +37,9 @@ export class NodeSecureMemory implements SecureMemory {
     private readonly hasNative: boolean;
 
     constructor() {
+        // Deliberately silent: a library must not write to stdout on construction.
+        // Callers surface this via getProtectionInfo() under their own debug flag.
         this.hasNative = nativeAddon !== null;
-        if (this.hasNative) {
-            console.log('nomyo-native addon loaded: mlock + secure-zero available');
-        }
     }
 
     /**