Tighten up repo a bit for AI

[withinfocus]

🎟️ Tracking

https://bitwarden.slack.com/archives/C09527A0AHG/p1770308121232559

📔 Objective

Adds the Claude settings file for the marketplace reference and shrinks the PR template to use less context.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Checkmarx One – Scan Summary & Details – ecec1646-43ec-4cc1-a32c-953aca1350ea

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.25%. Comparing base (0159052) to head (294d3c0).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6957      +/-   ##
==========================================
- Coverage   60.21%   56.25%   -3.97%     
==========================================
  Files        1976     1976              
  Lines       87536    87536              
  Branches     7810     7810              
==========================================
- Hits        52714    49246    -3468     
- Misses      32907    36460    +3553     
+ Partials     1915     1830      -85     

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[withinfocus]

Tests finally succeeded after four runs ...