Adding AI steering docs to the FDC3 repo

[kriswest]

Describe your change

The FDC3 repo is complex and the relationship between different packages and the FDC3 documentation is not always immediately obvious. This PR adds AI steering docs (AGENTS.md, plus Amazon Q, Krio and Gitlab Duo specific files referencing it) to help guide agents that are used to prepare contributions. Some specific guidance is given on the relationship between packages, and where the relevant documentation resides, to encourage agents to create better contributions.

This is a first pass at generating guidance based on recent work I've been doing. There is much more that could be added - but I believe this is a worthwhile firs pass.

Related Issue

resolves #1866

Contributor License Agreement

• I acknowledge that a contributor license agreement is required and that I have one in place or will seek to put one in place ASAP.

Review Checklist

• Issue: If a change was made to the FDC3 Standard, was an issue linked above?
• CHANGELOG: Is a CHANGELOG.md entry included?

[netlify]

✅ Deploy Preview for fdc3 canceled.

Name	Link
🔨 Latest commit	b1d33cc
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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.61%. Comparing base (cc84068) to head (b1d33cc).

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #1867    +/-   ##
========================================
  Coverage   95.61%   95.61%            
========================================
  Files          69       69            
  Lines        4680     4680            
  Branches      772      912   +140     
========================================
  Hits         4475     4475            
  Misses        205      205            

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