Add dart_node_vsix package and CI for Too Many Cooks

[MelbourneDeveloper]

TLDR;

New dart_node_vsix package for VSCode extension Dart bindings + CI pipeline for Too Many Cooks MCP server and VSCode extension tests.

What Does This Do?

• Adds packages/dart_node_vsix: Dart interop bindings for VSCode extension API
• Rewrites examples/too_many_cooks_vscode_extension from TypeScript to Dart (using dart2js)
• Adds CI jobs: too-many-cooks-mcp (builds MCP server) and vscode-extension (runs 38 extension tests)
• All test failures break the build - no silent failures

Brief Details?

• VSCode extension tests use @vscode/test-cli with xvfb on CI
• MCP server compiled with dart2js + node_preamble for Node.js compatibility
• Full parity with TypeScript version: agents tree, locks tree, messages tree, status bar, dashboard panel

How Do The Tests Prove The Change Works?

• 38 VSCode extension tests covering: activation, commands, configuration, MCP integration, status bar, tree views
• CI builds MCP server, compiles Dart to JS, runs tests in headless VSCode
• npm test exits non-zero on any test failure → build fails

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