🔖 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

README.md

@@ -76,7 +76,8 @@ Requires TypeScript 5.2+ and Node 20+. `reflect-metadata` is not needed and
 
 > **Toolchain note.** Standard decorators are transformed by `tsc` and by esbuild (so Vite
 > works). They are **not** yet transformed by oxc; if your toolchain uses it, decorator syntax
-> will fail to parse. v1.x, which uses legacy decorators, remains available for those setups.
+> will fail to parse. The 0.1.x line, which uses legacy decorators, remains available for
+> those setups.
 
 ## Quick Start