docs: convert GitHub Copilot instructions to AGENTS.md

[EndlessTrax]

Summary

Convert repository AI instructions from the GitHub Copilot specific format (.github/copilot-instructions.md) to the universal standard AGENTS.md in the repository root.

Changes

• Renamed and converted .github/copilot-instructions.md to AGENTS.md.
• Preserved all snippet conventions, validation commands, release constraints, and commit guidelines.

Validation

• npm test passed.
• npx vsce package verified packaging succeeds.

[Copilot]

🟢 Approval recommended

The changes are limited to documentation heading/title standardization, and no inconsistencies or leftover references to the prior instructions format were found.

Pull request overview

Updates the repository’s agent-facing documentation by using the universal AGENTS.md convention, keeping existing guidance intact while standardizing section headings and naming.

Changes:

• Standardized heading capitalization across sections (e.g., “Project Structure”, “Snippet Conventions”).
• Clarified a section title to “Commands & Validation” to better reflect included workflow steps.
• Renamed/retitled other headings for consistency (e.g., “Releases & Boundaries”, “Pull Request Checks”).

File summaries

File	Description
AGENTS.md	Aligns agent instructions with the AGENTS.md standard and normalizes section headings without changing the underlying guidance.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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