feat(sdk): sync agent API spec with routes and primary interface

[retr0h]

Summary

• Update agent API spec with routes, primary interface, and facts fields
• Add domain type converters for new agent fields (PrimaryInterface, Routes)
• Improve test coverage for agentFromGen to 100%

Test plan

• Unit tests pass (just go::unit)
• agentFromGen coverage at 100%

🤖 Generated with Claude Code

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff            @@
##              main       #34   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines         1484      1501   +17     
=========================================
+ Hits          1484      1501   +17     

Files with missing lines	Coverage Δ
pkg/osapi/agent_types.go	100.00% <100.00%> (ø)

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