Update steering docs with schema storage, related issues, and project references

[kmcginnes]

Description

• Added schema storage documentation to structure.md covering SchemaStorageModel, edge connections, and incremental schema growth
• Added related issues guidelines to project-management.md with formatting rules for linking issues and PRs
• Added project management and organization references to AGENTS.md

Validation

Documentation-only changes. No code or tests affected.

Related Issues

N/A

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.88%. Comparing base (c5affc5) to head (f221592).
⚠️ Report is 65 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1527       +/-   ##
===========================================
+ Coverage   47.81%   64.88%   +17.07%     
===========================================
  Files         382      356       -26     
  Lines        8525     7949      -576     
  Branches     3159     2906      -253     
===========================================
+ Hits         4076     5158     +1082     
+ Misses       3070     2009     -1061     
+ Partials     1379      782      -597     

Flag	Coverage Δ
unittests	64.88% <ø> (+17.07%)	⬆️

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