refactor(workspace): rename @ktx/cli to @kaelio/ktx and pack it directly

Promote the CLI workspace package to the public name `@kaelio/ktx` and
drop the separate `scripts/build-public-npm-package.mjs` wrapper. The
CLI package is now publishable in place (`publishConfig.access: public`,
`provenance: true`), so artifact packing uses `pnpm pack` against
`packages/cli/` instead of assembling a parallel package tree.

Updates all workspace filter invocations, docs, tests, and release
readiness checks to reference the new package name, and folds the
tarball-name helper into `scripts/public-npm-release-metadata.mjs`.

scripts/standalone-ci-workflow.test.mjs

@@ -40,7 +40,7 @@ describe('standalone KTX CI workflow', () => {
       'pnpm install --frozen-lockfile',
       'pnpm run check',
       'pnpm run build',
-      'pnpm --filter @ktx/cli run test:slow',
+      'pnpm --filter @kaelio/ktx run test:slow',
       'pnpm run smoke',
       'actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405',
       'python-version: "3.13"',