Add doc comment standards and publishers helper foundation

[alng20]

Description

Related Issue

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to change)
• 📚 Documentation update
• 🧪 Test update
• 🔧 Refactor (no functional changes)

Changes Made

Testing

Data Layer Changes

• Ran npm run test:unit - all tests pass
• Added/updated Vitest tests for data-layer changes
• Generated a migration (npm run db:generate) for any schema change

Frontend Changes

• Ran npm run test:e2e - all tests pass
• Added data-testid attributes to interactive elements
• Verified build succeeds (npm run build)

Checklist

• My code follows the project's coding standards
• I have used explicit TypeScript types for function parameters and return values
• I have built the UI with Astro components and Tailwind CSS utility classes (dark theme)
• I have updated documentation (README, instruction files) if needed
• My changes are focused on a single concern
• I have written clear commit messages explaining what and why

Additional Notes

[Copilot]

Copilot review overview

🟡 Changes recommended

Add helper tests and document the standards in the required repository instruction and README locations.

Review effort: Lite
Findings: 1

Open (1)

• Add unit tests for data-access helper results and ordering · New

What changed in this PR

Adds repository documentation standards and a typed, deterministic publisher data-access helper.

Changes:

• Documents TSDoc and file-purpose comment requirements.
• Adds getAllPublishers with deterministic name ordering.

File	Summary
src/​lib/​publishers.ts	Adds publisher query helper; unit coverage is still needed.
.github/​copilot-instructions.md	Adds documentation standards; corresponding repository documentation is still needed.

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