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`.

.github/workflows/ci.yml

@@ -109,7 +109,7 @@ jobs:
         run: pnpm run build
 
       - name: Run slow CLI tests
-        run: pnpm --filter @ktx/cli run test:slow
+        run: pnpm --filter @kaelio/ktx run test:slow
 
   cli-smoke-tests:
     name: CLI smoke tests