Extract Serilog file logging into Libraries/SerilogFileLogging

[justindbaur]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-34566

📔 Objective

Moves AddSerilogFileLogging and its tests out of Core into a new src/Libraries/SerilogFileLogging library.

This allows services that need file logging to take a direct dependency on the library without depending on Core, supporting the broader effort to decompose Core into smaller, more focused libraries (ADR-0032).

Core continues to reference the library transitively for now, so existing consumers are unaffected.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR extracts AddSerilogFileLogging and its tests from Core into a new src/Libraries/SerilogFileLogging library, in line with the Core break-up effort (ADR-0032). The moved LoggerFactoryExtensions.cs is behaviorally identical to the original — only XML doc comments changed — and it retains the Bit.Core.Utilities namespace, matching how the other extracted libraries handle namespaces so existing consumers stay unaffected. Core picks up Serilog.Extensions.Logging.File transitively via the new ProjectReference, and all packages.lock.json files were regenerated consistently with the package moving from Direct to Transitive. No new dependencies were introduced, so no AppSec review is triggered. Both findings below are non-blocking tech debt.

Code Review Details

• ♻️ : New library and test projects are not registered in bitwarden-server.slnx, unlike all four sibling src/Libraries/ projects — they won't appear in IDEs and are skipped by the root dotnet format --verify-no-changes lint job
  • src/Libraries/SerilogFileLogging/SerilogFileLogging.csproj:1
• ♻️ : TempDirectory is a verbatim copy of the still-in-use test/Core.Test/TempDirectory.cs, carrying forward a #region that .claude/CLAUDE.md explicitly forbids
  • test/Libraries/SerilogFileLogging.Test/TempDirectory.cs:1

Minor, not commented inline: the two new test files omit the UTF-8 BOM that .editorconfig (charset = utf-8-bom) specifies for *.cs and that every sibling library file has.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.48%. Comparing base (b3d1eb9) to head (f27478d).
⚠️ Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8149      +/-   ##
==========================================
+ Coverage   62.88%   67.48%   +4.60%     
==========================================
  Files        2312     2312              
  Lines      100299   100325      +26     
  Branches     9021     9022       +1     
==========================================
+ Hits        63070    67703    +4633     
+ Misses      35053    30343    -4710     
- Partials     2176     2279     +103     

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