Document TrustedRouter OpenAI-compatible setup

[jperla]

Summary

• document TrustedRouter as an OpenAI-compatible routing option
• use https://api.trustedrouter.com/v1 as the base URL
• include the trustedrouter/zdr model alias for privacy-sensitive agent workloads

Why

TrustedRouter is useful for workflows that involve private code, customer data, or other sensitive context. It provides open-source, verifiable attested routing and does not log prompts or outputs by default.

Validation

• git diff --check

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.14%. Comparing base (f82711f) to head (4d2d35c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #811      +/-   ##
==========================================
+ Coverage   82.10%   82.14%   +0.03%     
==========================================
  Files         137      137              
  Lines        6344     6344              
  Branches     1122     1122              
==========================================
+ Hits         5209     5211       +2     
+ Misses        684      683       -1     
+ Partials      451      450       -1     

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[crmne]

Looks like promotion.