New Bun:FFI API for Layout Engine

[HALQME]

This pull request introduces significant project structure and configuration changes, focusing on build tooling, testing, and the public API. It removes the btuin package's published configuration, updates monorepo-level scripts and dependencies, and simplifies the example and documentation to reflect a new, easier-to-use API. Additionally, it migrates test and build tasks to a new tool (mise), and removes legacy test and configuration files.

Key changes include:

Project Structure and Tooling

• Removed the package.json files from both the btuin and layout-engine packages, making these packages unpublished and managed solely within the monorepo. This centralizes dependency and script management. [1] [2]
• Introduced mise.toml for unified tool and task management, replacing most previous scripts and developer commands. Tasks for build, lint, format, test, and profiling are now defined here.
• Added a bunfig.toml file to specify the root directory for tests, standardizing test discovery.

Monorepo Configuration

• Updated the root package.json:
  • Removed all npm scripts in favor of mise tasks.
  • Set an explicit version and updated the required bun engine version.

Documentation and Examples

• Updated the README.md:
  • Changed the getting started and sample code to use a new, simplified API (init/render instead of setup).
  • Updated showcase instructions to reference the new neon dashboard example.

Codebase Cleanup

• Removed the main app runtime (app.ts), component system (component.ts), and the related runtime test (app.test.ts), indicating a major refactor or migration to a new architecture or API. [1] [2] [3]

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Most important changes:

Project and Package Management

• Removed package.json from btuin and layout-engine, making these packages unpublished and managed internally. [1] [2]
• Added mise.toml for tool and task management, and bunfig.toml to configure test roots. [1] [2]

Monorepo Scripts and Dependencies

• Centralized all build, lint, and test scripts in the root, removing them from package.json and using mise tasks instead.
• Updated root package.json with a version and stricter bun engine requirement.

Documentation and API

• Updated README.md to reflect a new, simplified API and showcase example. [1] [2]

Codebase Simplification

• Removed the old runtime app, component system, and related tests, indicating a major refactor or migration to a new architecture. [1] [2] [3]

[github-actions]

🚀 Performance Benchmark Result

          Performance Limits Report 5 runs
====================================================
| FPS Target | Avg Nodes |  Min  |  Max  | Std Dev |
|------------|-----------|-------|-------|---------|
| 120 FPS    | 3500      | 3100  | 4000  | ±374    |
|  60 FPS    | 6160      | 5400  | 7000  | ±706    |
|  30 FPS    | 11240     | 10500 | 12000 | ±609    |
|  15 FPS    | 20680     | 19200 | 22600 | ±1388   |
====================================================

Run Details

Triggered by commit: 8b5fdd9