Initial boilerplate scaffold for continuum-common

Adds ts-core (logger, Supabase JWT verification, Elysia error
transformers) and rust-core (thiserror error type, tracing init,
G-code checksum/header parsing) packages.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

packages/ts-core/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "@continuum/ts-core",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "module": "src/index.ts",
+  "types": "src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc -p tsconfig.json --noEmit"
+  },
+  "dependencies": {
+    "jose": "^5.9.6"
+  },
+  "peerDependencies": {
+    "elysia": ">=1.1.0"
+  },
+  "peerDependenciesMeta": {
+    "elysia": {
+      "optional": true
+    }
+  },
+  "devDependencies": {
+    "@types/bun": "^1.1.14",
+    "typescript": "^5.6.3",
+    "elysia": "^1.1.26"
+  }
+}