Add browser demo, exact model APIs, and native SDKs

[pnegahdar]

What changed

• adds the serverless microphone-first browser demo and GitHub Pages deployment at https://bearlyai.github.io/seda/
• makes SedaBrowser.prepare({ modelId }) the primary browser readiness API while retaining create() as a deprecated alias
• makes exact modelId + variant the primary native preparation/startup API; profiles remain optional convenience aliases
• exposes immutable resolved model identity: ID, upstream revision, runtime-specific variant, and runtime
• moves language selection to each transcription or live stream and reports fixed, prompted, automatic, or checkpoint language behavior honestly
• adds typed Python, Go, and Swift protocol clients
• adds real Rust-sidecar HTTP/WebSocket integration tests for all three SDKs
• rewrites the root README, package READMEs, and guides around concrete microphone, CLI, Electron, browser, Python, Go, and Swift usage
• keeps pnpm's strict seven-day dependency quarantine with no exceptions; the Python client's two dependencies are pinned to established releases

API shape

const browser = await SedaBrowser.prepare({
  modelId: "onnx-community/moonshine-tiny-ONNX",
});
const microphone = await browser.microphone({
  language: "en",
  onTranscript: ({ text }) => render(text),
});
const final = await microphone.stop();

await SedaNode.prepare({
  modelId: "nvidia/nemotron-3.5-asr-streaming-0.6b",
  variant: "q4_k",
});
const seda = await SedaNode.start({
  modelId: "nvidia/nemotron-3.5-asr-streaming-0.6b",
  variant: "q4_k",
});
const german = await seda.listen({ language: "de-DE" });
const japanese = await seda.listen({ language: "ja-JP" });

The model stays resident between those streams.

Validation

• Rust format, Clippy with warnings denied, and all workspace tests
• TypeScript check, JavaScript unit/integration tests, and package builds
• GitHub Pages production bundle build under /seda/
• Playwright: Chromium, Firefox, and WebKit browser/session/demo coverage
• real Moonshine WASM model transcription in Chromium
• exact pinned Parakeet download, size/SHA-256 verification, doctor identity, and real Metal streaming transcription
• Python wheel install plus unit and live sidecar integration tests
• Go unit and live sidecar integration tests
• Swift package build plus unit and live sidecar integration tests
• dependency quarantine policy check
• git diff --check

Pages

The workflow deploys the production browser artifact after this lands on main:

https://bearlyai.github.io/seda/