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/adapters/css.ts

@@ -0,0 +1,51 @@
+import type { RuntimeDeterministicAdapter } from "../types";
+
+export function createCssAdapter(params?: {
+  resolveStartSeconds?: (element: Element) => number;
+}): RuntimeDeterministicAdapter {
+  let entries: Array<{
+    el: HTMLElement;
+    baseDelay: string;
+    basePlayState: string;
+  }> = [];
+
+  return {
+    name: "css",
+    discover: () => {
+      entries = [];
+      const all = document.querySelectorAll("*");
+      for (const rawEl of all) {
+        if (!(rawEl instanceof HTMLElement)) continue;
+        const style = window.getComputedStyle(rawEl);
+        if (!style.animationName || style.animationName === "none") continue;
+        entries.push({
+          el: rawEl,
+          baseDelay: rawEl.style.animationDelay || "",
+          basePlayState: rawEl.style.animationPlayState || "",
+        });
+      }
+    },
+    seek: (ctx) => {
+      const time = Number(ctx.time) || 0;
+      for (const entry of entries) {
+        if (!entry.el.isConnected) continue;
+        const start = params?.resolveStartSeconds
+          ? params.resolveStartSeconds(entry.el)
+          : Number.parseFloat(entry.el.getAttribute("data-start") ?? "0") || 0;
+        const localTime = Math.max(0, time - start);
+        entry.el.style.animationPlayState = "paused";
+        entry.el.style.animationDelay = `-${localTime.toFixed(3)}s`;
+      }
+    },
+    pause: () => {
+      for (const entry of entries) {
+        if (!entry.el.isConnected) continue;
+        entry.el.style.animationPlayState = entry.basePlayState || "paused";
+        if (entry.baseDelay) entry.el.style.animationDelay = entry.baseDelay;
+      }
+    },
+    revert: () => {
+      entries = [];
+    },
+  };
+}