feat: add 7 new plugins with snippet-based architecture

[KailasMahavarkar]

Summary

• Adds 7 new plugins: lenis, react, echo, golang, rust, design-tokens, ui-ux
• All code examples stored as .md files in snippets/<plugin>/ — zero inline template literals in any data.ts
• Every plugin follows the reactflow/motion pattern: loader.ts → createSnippetLoader → snippet("path/file.md")
• 370 snippet files total across all new plugins

Plugins added

Plugin	Snippets	Tools	Source
lenis	31	6	lenis-skill
react	13	4	react-skill
echo	33	6	echo-skill
golang	43	6	golang + golang-design-pattern skills
rust	28	4	rust-skill
design-tokens	24	7	design-tokens-skill
ui-ux	25	6	ui-ux-skill

Architecture

Each plugin stores all code examples in snippets/<name>/<category>/<name>.md and loads them at runtime:

// loader.ts
export const snippet = createSnippetLoader("golang");

// data.ts
good: snippet("practices/error-wrapping-good.md"),
bad:  snippet("practices/error-wrapping-bad.md"),

Test plan

• npm run build — clean tsc, 0 errors
• All 7 plugins import and load without throwing
• 0 inline template literals remaining in any data.ts

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