feat(core): initial release with 3-tier secret storage

Implements SmartSecret with macOS Keychain, Linux secret-tool, and AES-256-GCM encrypted file fallback backends. Zero runtime dependencies.

ts/00_commitinfo_data.ts

@@ -0,0 +1,8 @@
+/**
+ * autocreated commitinfo by @pushrocks/commitinfo
+ */
+export const commitinfo = {
+  name: '@push.rocks/smartsecret',
+  version: '1.0.0',
+  description: 'OS keychain-based secret storage with encrypted-file fallback for Node.js.',
+};