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/cli/src/utils/project.ts

@@ -0,0 +1,30 @@
+import { existsSync, statSync } from "node:fs";
+import { resolve, basename } from "node:path";
+import { errorBox } from "../ui/format.js";
+
+export interface ProjectDir {
+  dir: string;
+  name: string;
+  indexPath: string;
+}
+
+export function resolveProject(dirArg: string | undefined): ProjectDir {
+  const dir = resolve(dirArg ?? ".");
+  const name = basename(dir);
+  const indexPath = resolve(dir, "index.html");
+
+  if (!existsSync(dir) || !statSync(dir).isDirectory()) {
+    errorBox("Not a directory: " + dir);
+    process.exit(1);
+  }
+  if (!existsSync(indexPath)) {
+    errorBox(
+      "No composition found in " + dir,
+      "No index.html file found.",
+      "Run npx hyperframes init to create a new composition.",
+    );
+    process.exit(1);
+  }
+
+  return { dir, name, indexPath };
+}