feat: Add end-user skills routines

[rkaraivanov]

Description

Add end-user skills guides for framework integration, theming, and bundle optimization.

Type of Change

• New feature (non-breaking change that adds functionality)
• Documentation update

Checklist

• I have updated documentation if needed

[IMinchev64]

Shouldn't the added SKILL.md files be placed inside a dedicated hidden folder such as .github (as I see there are already other skills there), instead of the root directory?

[rkaraivanov]

Shouldn't the added SKILL.md files be placed inside a dedicated hidden folder such as .github (as I see there are already other skills there), instead of the root directory?

The one in the .github directory are for our internal usage with Copilot. These new ones are for users of the library. The delivery mechanism is still in TBD phase but for now they will "live" in the root of the repository.

[Copilot]

Pull request overview

This PR adds comprehensive end-user skills documentation for GitHub Copilot and other LLM agents to help developers effectively use Ignite UI Web Components in their applications. The PR introduces four major skill guides covering framework integration, component selection, theming, and bundle optimization, along with framework-specific reference documentation for React, Angular, Vue, and vanilla JavaScript.

Changes:

• Added four comprehensive skill guides with step-by-step instructions, code examples, and best practices
• Created framework-specific integration references for React, Angular, Vue, and vanilla JavaScript
• Updated build script to include skills directory in distribution
• Fixed incorrect documentation links in README (Form component and Grid Lite package name)

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
skills/README.md	Overview and navigation for end-user skills documentation
skills/igniteui-wc-choose-components/SKILL.md	Component selection guide with catalog and usage patterns
skills/igniteui-wc-integrate-with-framework/SKILL.md	Main framework integration skill with detection logic
skills/igniteui-wc-integrate-with-framework/references/react.md	React-specific integration guide using igniteui-react package
skills/igniteui-wc-integrate-with-framework/references/angular.md	Angular integration with CUSTOM_ELEMENTS_SCHEMA configuration
skills/igniteui-wc-integrate-with-framework/references/vue.md	Vue 3 integration with isCustomElement configuration
skills/igniteui-wc-integrate-with-framework/references/vanilla-js.md	Vanilla JavaScript/TypeScript integration guide
skills/igniteui-wc-customize-component-theme/SKILL.md	Comprehensive theming guide covering CSS variables, Sass, and MCP server
skills/igniteui-wc-optimize-bundle-size/SKILL.md	Bundle optimization guide with lazy loading and tree-shaking strategies
scripts/build.mjs	Added skills directory copying to build process
README.md	Fixed incorrect Form component reference and Grid Lite package name