release 0.1.0-beta.2

Bump src/version.ts and package.json together; release.ts refuses to build if
they disagree, or if the git tag disagrees with either.

Also updates the version shown in the README and MCP sample headers, and the
example in development.md so it points at the next release rather than this one.

src/version.ts

@@ -5,7 +5,7 @@
  * fails inside the shipped binary. A constant is compiled in and always correct.
  * `scripts/release.ts` checks it against the release tag so the two cannot drift.
  */
-export const VERSION = '0.1.0-beta.1';
+export const VERSION = '0.1.0-beta.2';
 
 /** What `--version` prints: enough to identify a build from a bug report. */
 export function versionLine(): string {