Migrate repository agent rules from .clinerules to agents.md

[jennyf19]

Problem Statement:
Our repo currently uses the .clinerules directory to define agent and automation rules. GitHub now widely supports agents.md as the standard for agent instructions and workflow automation.

Please:

Review the contents of .clinerules (repo reference).
Migrate all relevant rules and configuration into a new root-level agents.md file, using markdown with YAML or JSON code blocks as appropriate.
Add context and documentation to agents.md so it’s clear to contributors how agent automation is configured and used.
Remove the .clinerules directory.
Ensure the copilot instructions point to the new agent.md, reference
Update any references in README or docs from .clinerules to agents.md.
Please propose these changes in a single pull request.
Goals:

Leverage modern agent automation workflows
Improve contributor experience and documentation
Ensure no loss of important rules or configuration during migration
References:

Current .clinerules directory
GitHub agents.md documentation