🔖 chore: number the standard-decorator line 0.2.0, not 2.0.0

Nothing has been published to npm, so 2.0.0 claimed a 1.0.0 predecessor that no
one could install. Staying on 0.x states what is true — the API may still move —
and under semver a breaking change is then a minor bump, which is precisely the
relationship between the two lines: 0.1.x keeps legacy experimentalDecorators,
0.2.x moves to TC39 standard decorators.

The break itself is unchanged and still documented; only the number and the
references to the other line moved.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SAcqrz3FcadkYr3xG32CjK

package.json

@@ -1,7 +1,7 @@
 {
   "name": "cereale",
-  "version": "2.0.0",
-  "description": "Strongly typed JSON mapping and validation for TypeScript classes \u2014 validated domain objects, not validated data",
+  "version": "0.2.0",
+  "description": "Strongly typed JSON mapping and validation for TypeScript classes — validated domain objects, not validated data",
   "type": "module",
   "main": "./dist/cjs/index.js",
   "module": "./dist/esm/index.js",