doc: added READMEs per module, updated agentic instructions

[fredbi]

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.79%. Comparing base (c234c6a) to head (2a11254).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #439   +/-   ##
=======================================
  Coverage   84.79%   84.79%           
=======================================
  Files          58       58           
  Lines        3809     3809           
=======================================
  Hits         3230     3230           
  Misses        440      440           
  Partials      139      139           

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