fix: remove hardcoded theme colors and rely on semanticTokenScopes

[marcelinollano]

Summary

The VS Code extension was hardcoding dark hex colors in configurationDefaults using exact theme name matching. Anyone on a light theme or any third-party theme got dark colors on a white background. This removes all hardcoded colors and lets the active theme supply them automatically via semanticTokenScopes.

The semanticTokenScopes table in package.json maps each semantic token type (emitted by the LSP) to a standard TextMate scope name. VS Code looks those scopes up in the active theme and applies the theme's own colors — so any light, dark, high contrast, or third-party theme just works.

Also removes buildVscodeRules from the Monaco package and the sync-theme script, which were only needed to generate the now-deleted hardcoded color block.

Before

• Light theme users and third-party theme users see dark hex colors hardcoded by the extension, overriding their theme
• Theme name matching only covered Default Light+, Default Light Modern, Default High Contrast Light — any other light theme broke

After

• Colors are sourced from the active theme automatically for any theme
• semanticTokenScopes covers all 13 token types the LSP emits with well-supported standard TM scope names
• ~250 lines of hardcoded color configuration deleted

Testing

Manual verification:

1. Install the extension from the .vsix in packages/vscode/publish/ after building:

   pnpm --filter @agentscript/vscode build
   cd packages/vscode && node esbuild.mjs --stage
   cd staging && vsce package --no-dependencies -o ../publish/
   code --install-extension publish/agent-script-language-client-*.vsix
   

2. Open any .agent file
3. Switch between themes via Cmd+K Cmd+T and verify:
   • Default Dark+: keywords purple, strings orange, comments green
   • Default Light+: keywords purple, strings red-brown, comments grey-green
   • Any third-party light theme (e.g. GitHub Light, Ayu Light): colors match the theme's own palette instead of dark colors on white background

[awli]

I hope this isn't used in Monaco