fix: read CLI version from package.json so it cannot drift

[brainsparker]

Why

npx youagent --version prints 0.1.0 while the published package is 0.0.2. The version string in src/cli/index.ts is hardcoded, so every npm version bump silently leaves the CLI reporting the wrong number. Spotted during the clean-machine verification of the 0.0.2 release.

What changed

src/cli/index.ts resolves the version from package.json at runtime via createRequire(import.meta.url). The relative depth is identical in dev (src/cli/) and in the tsup output (dist/cli/), so the same path works in both. No tsconfig or build changes needed.

Validation

• npm run build clean, tsc --noEmit clean, full test suite passes
• node dist/cli/index.js --version now prints 0.0.2, matching package.json
• Future npm version patch bumps are picked up automatically with no code change