initial code (#2)

* feat: initial code port from hyperframes-internal

Port all OSS-ready packages from the internal monorepo:
- @hyperframes/core — shared types, HTML generation, GSAP utilities, runtime
- @hyperframes/cli — CLI for creating, previewing, and rendering compositions
- @hyperframes/engine — framework-agnostic rendering engine (BeginFrame + FFmpeg)
- @hyperframes/producer — video rendering pipeline (Puppeteer + FFmpeg)
- @hyperframes/ui-player — browser-based video player component
- @hyperframes/studio — composition editor (React frontend + Hono backend)

Includes regression test suite with Docker-based test harness.

All HeyGen-internal references, deployment infrastructure, and
proprietary assets have been removed. Package names migrated
from @app/* to @hyperframes/*.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: scrub internal codenames and stale references from OSS port

- Replace static.heygen.ai runtime URLs in test fixtures
- Remove internal CDN publish script (publish-hyperframe-runtime.ts)
- Replace sandbox-studio, sandbox-interceptor, __magicEditRuntime
  with neutral names (studio, hyperframe-runtime, __hyperframeRuntime)
- Fix stale Vault API / localhost references in docs
- Remove broken deprecated_studio link

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: remove remaining internal codenames and stale references

- Delete stale producer README.md and PIPELINE.md (referenced nonexistent files)
- Replace "Cerberus" codename with "HyperFrames" in test design reviews
- Replace magic-edit postMessage identifiers with hf-preview/hf-parent
- Rename debug-magic-edit-timeline.ts to debug-timeline.ts
- Replace "Motion Cut" with "HyperFrames" in Timeline comments
- Fix studio/CLI references to nonexistent archive package
  (use local data/projects/ dir, stub render proxy)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/core/src/runtime/entry.ts

@@ -0,0 +1,24 @@
+import { initSandboxRuntimeModular } from "./init";
+
+type HyperframeWindow = Window & {
+  __hyperframeRuntimeBootstrapped?: boolean;
+};
+
+// Inline composition scripts can run before DOMContentLoaded.
+// Ensure timeline registry exists at script evaluation time.
+(window as HyperframeWindow).__timelines = (window as HyperframeWindow).__timelines || {};
+
+function bootstrapHyperframeRuntime(): void {
+  const win = window as HyperframeWindow;
+  if (win.__hyperframeRuntimeBootstrapped) {
+    return;
+  }
+  win.__hyperframeRuntimeBootstrapped = true;
+  initSandboxRuntimeModular();
+}
+
+if (document.readyState === "loading") {
+  document.addEventListener("DOMContentLoaded", bootstrapHyperframeRuntime, { once: true });
+} else {
+  bootstrapHyperframeRuntime();
+}