Add beginner-friendly high-level SDK API and quickstart example

[GsCommand]

Motivation

• Make the TypeScript SDK the primary, beginner-friendly front door for CommandLayer by adding a concise run/verify surface and a quickstart example.
• Default to the hosted runtime at https://runtime.commandlayer.org while preserving existing low-level APIs and backwards-compatible options.

Description

• Add a high-level commandlayer export with commandlayer.run(action, input, options?) and commandlayer.verify(receipt, options?) backed by a module-wide default client.
• Add CommandLayerClient.run(...) and CommandLayerClient.verify(...) helpers and extend createClient(options?) to accept baseUrl (falls back to runtime and https://runtime.commandlayer.org).
• Ensure commandlayer.verify delegates to the existing verifyReceipt logic and return a beginner-friendly valid alias (valid === ok) while leaving the full VerifyResult intact.
• Add examples/quickstart-node (package.json, index.js, README.md) and update the top of the repo and TypeScript SDK README.md to show install + a 10-line run/verify example.
• Add tests in typescript-sdk/tests/high-level-api.test.mjs for default baseUrl, custom baseUrl, commandlayer.run delegation, and commandlayer.verify delegation, and keep all existing low-level exports unchanged.

Testing

• Successfully built the TypeScript SDK with npm run build in typescript-sdk and produced dist artifacts.
• Ran the new high-level tests with node --test typescript-sdk/tests/high-level-api.test.mjs and they passed.
• Ran the package test run (npm test) which produced 43 passed, 1 failed; the single failing assertion is from an existing unit test in the suite and appears unrelated to the added high-level onboarding API.

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Codex Task