Add custom copilot instructions and skills

[albx]

This pull request introduces comprehensive documentation and reference materials for authoring, extending, and testing BitBlazor library components. It establishes clear guidelines, anti-patterns, code patterns, documentation templates, and storybook conventions to ensure consistency, accessibility, and best practices across the BitBlazor component library.

The most important changes are:

Skill Definition and Metadata

• Added .agents/skills/blazor/SKILL.md containing detailed guidelines for BitBlazor component authoring, including workflow, base class hierarchy, CSS class composition, accessibility requirements, and validation steps.
• Introduced .agents/skills/blazor/manifest.json specifying the skill version, category, and package prefix for BitBlazor.

Reference Documentation

• Added references/patterns.md describing recommended code patterns for general-purpose and form components, CSS class composition, performance best practices, and JS interop usage.
• Added references/anti-patterns.md listing common mistakes and their solutions for BitBlazor component development.
• Added references/testing.md (not shown in the diff, but referenced) for bUnit testing conventions.
• Added references/stories.md detailing how to create and structure BlazingStory files for component previews, including file location, structure, and conventions for Storybook integration.
• Added references/docs-template.md providing a standardized template and conventions for component documentation pages, including required sections, parameter tables, enum documentation, and usage examples.

Accessibility and Quality

• Embedded accessibility requirements and validation steps directly in the skill documentation, referencing the authoritative a11y.instructions.md and enumerating common accessibility checks (BL1–BL6) for new components.

These changes together establish a strong foundation for consistent, accessible, and maintainable BitBlazor component development.

[Copilot]

Pull request overview

This PR adds repository-scoped agent definitions, Copilot instruction files, and reusable skills/reference docs to standardize BitBlazor component authoring (including accessibility and testing) and documents where contributors can find and extend these assets.

Changes:

• Added new repo instruction files for Blazor component authoring conventions and a comprehensive WCAG 2.2 AA accessibility ruleset.
• Added agent definitions (developer, code-reviewer, software-architect, projectmanager) plus skills (blazor, issue-reader, issue-writer) and supporting reference docs/templates.
• Updated docs index to link to a new “Agents, Instructions & Skills” reference page.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
docs/README.md	Adds a docs index entry linking to the new agents/skills reference page.
docs/agents-and-skills.md	New contributor-facing index of repo agents, instruction files, and skills.
.github/instructions/blazor.instructions.md	New Blazor component authoring conventions intended to apply to Razor/component files.
.github/instructions/a11y.instructions.md	New comprehensive accessibility standards and anti-pattern catalog (WCAG 2.2 AA).
.github/agents/software-architect.agent.md	Defines the software-architect agent scope/workflow and skill dependency.
.github/agents/projectmanager.agent.md	Defines the projectmanager agent workflow for creating issues (with skill dependencies).
.github/agents/developer.agent.md	Defines the developer agent workflow for implementing BitBlazor work (with skill dependencies).
.github/agents/code-reviewer.agent.md	Defines the code-reviewer agent workflow for standards + accessibility review.
.agents/skills/issue-writer/SKILL.md	Adds a CLI-driven workflow for creating GitHub issues in this repo.
.agents/skills/issue-writer/manifest.json	Skill manifest metadata for issue-writer.
.agents/skills/issue-reader/SKILL.md	Adds a CLI-driven workflow for retrieving/searching GitHub issues in this repo.
.agents/skills/issue-reader/manifest.json	Skill manifest metadata for issue-reader.
.agents/skills/blazor/SKILL.md	Adds the BitBlazor component authoring/review skill with links to references.
.agents/skills/blazor/manifest.json	Skill manifest metadata for blazor.
.agents/skills/blazor/references/testing.md	Adds bUnit testing conventions and examples.
.agents/skills/blazor/references/stories.md	Adds BlazingStory story file conventions and template.
.agents/skills/blazor/references/patterns.md	Adds component patterns for base classes, CSS class building, performance, JS interop.
.agents/skills/blazor/references/docs-template.md	Adds a standard documentation page template and required sections.
.agents/skills/blazor/references/anti-patterns.md	Adds a concise list of common BitBlazor anti-patterns and fixes.

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