Add automatic JS binding generation from WinRT metadata

[lei9444]

Description

Add winapp node generate-bindings command that generates typed JS/TS bindings from WinRT metadata using winrt-meta.

• Interactive setup after winapp init: Detects Node.js projects (package.json), prompts the user to generate bindings and select language (JS or TS), then auto-configures
  winapp.yaml and generates bindings
• Auto-generate on winapp restore: Silently regenerates bindings if jsBindings is already configured in winapp.yaml
• Auto-discover all WinAppSDK packages: Scans the NuGet dependency chain to find all packages with .winmd metadata (Foundation, AI, ML, Search, etc.) — no manual package
  configuration needed
• Smart UI exclusion: Excludes UI-only packages (WinUI, Widgets) and winmd files (Microsoft.UI., Microsoft.Web.WebView2.) from code generation, but uses them as --ref for type
  resolution — zero warnings
• Works across SDK versions: Handles both the 1.6-style flat layout (lib/uap10.0/) and 1.8+ sub-package structure (metadata/), tested with 1.6, 1.8, and 2.0
• Auto-installs dynwinrt-js runtime dependency into the user's project
• Ships winrt-meta as a CLI dependency — users don't need to install it separately

Usage Example

After winapp init in a Node.js project, the CLI prompts the user to optionally
generate JS or TS bindings. If accepted, it:

1. Adds a jsBindings section to winapp.yaml with the chosen language
2. Installs dynwinrt-js as a runtime dependency
3. Auto-discovers WinAppSDK packages and generates bindings

On subsequent winapp restore, bindings are regenerated automatically if configured.

To regenerate manually: npx winapp node generate-bindings

Type of Change

• ✨ New feature

Checklist

• Tested locally on Windows
• docs/usage.md updated (if CLI commands changed)

[github-actions]

Build Metrics Report

Binary Sizes

Artifact	Baseline	Current	Delta
CLI (ARM64)	25.92 MB	N/A	N/A
CLI (x64)	26.54 MB	N/A	N/A
MSIX (ARM64)	11.08 MB	N/A	N/A
MSIX (x64)	11.79 MB	N/A	N/A
NPM Package	23.01 MB	N/A	N/A

Test Results

❌ 409 passed, 5 failed out of 414 tests in 445.7s (+38.0s vs. baseline)

Test Coverage

❌ 41.9% line coverage, 45.5% branch coverage · ⚠️ -0.4% vs. baseline

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Updated 2026-04-01 12:56:40 UTC · commit e89b5bd · workflow run