docs(NODE-7685): add AGENTS.md file

[johnmtll]

Description

Summary of Changes

Adds an AGENTS.md file to the project root, giving key context to ai coding agents on session creation. Conforms with agentskills.io. Features a sync script to support nested AGENTS.md files. Scaffolds the directory for shared skills.

Notes for Reviewers

What is the motivation for this change?

Release Highlight

Release notes highlight

Double check the following

• Lint is passing (npm run check:lint)
• Self-review completed using the steps outlined here
• PR title follows the correct format: type(NODE-xxxx)[!]: description
  • Example: feat(NODE-1234)!: rewriting everything in coffeescript
• Changes are covered by tests
• New TODOs have a related JIRA ticket

[Copilot]

Pull request overview

Adds AI-agent guidance to the repository following agentskills.io conventions, establishing AGENTS.md as the canonical instruction source and wiring up companion tooling/docs to keep tool-specific references in sync.

Changes:

• Add root AGENTS.md and a root CLAUDE.md that imports it.
• Introduce scripts/symlink-claude-md.sh to generate/cleanup CLAUDE.md companions for staged AGENTS.md files and to sync .claude/skills to .agents/skills.
• Document the convention and workflow in README.md and scaffold .agents/skills/.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
scripts/symlink-claude-md.sh	Adds a sync script for CLAUDE.md references and .claude/skills symlink management.
README.md	Documents the AI agent configuration approach and how to add nested AGENTS.md.
CLAUDE.md	Adds a tool-specific import reference to AGENTS.md.
AGENTS.md	Adds canonical AI coding agent instructions and project conventions/context.
.agents/skills/.gitkeep	Creates the skills directory scaffold for future shared skills.

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