Add library documentation

[justindbaur]

🎟️ Tracking

📔 Objective

Adds the library documentation file references in ADRs 31 and 32. This along with moving fundamental utilities will hopefully enable teams to start on the journey of owning things from the ground up.

📸 Screenshots

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.45%. Comparing base (e0ba28c) to head (b5390fa).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7950   +/-   ##
=======================================
  Coverage   61.45%   61.45%           
=======================================
  Files        2245     2245           
  Lines       98844    98844           
  Branches     8944     8944           
=======================================
  Hits        60743    60743           
  Misses      35952    35952           
  Partials     2149     2149           

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[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This documentation PR adds src/Libraries/LIBRARY.md — a canonical shape for libraries under src/Libraries/ — and references it from the writing-server-code skill. Reviewed the new doc's C# examples for correctness, the relative file reference from SKILL.md (resolves correctly), and the Claude configuration change. No security, correctness, or breaking-change concerns; content aligns with ADR-0031/0032 and the repo's dual-ORM and TryAdd* DI conventions.

Code Review Details

• 🎨 : AddFoo repository example declares an IServiceCollection return type but has no return statement (CS0161 if copied verbatim)
  • src/Libraries/LIBRARY.md:106