fix(agents): support configurable builtin models

[samwillis]

Summary

• Add a built-in model catalog for Anthropic and OpenAI keys and expose model selection in Horton's creation schema.
• Let Horton and Worker resolve the selected provider/model, including session-level reasoning effort for compatible OpenAI reasoning models.
• Switch context tool schemas to TypeBox so OpenAI tool validation accepts them.

Looks like this:

Test plan

• pnpm -C packages/agents test -- --run test/model-catalog.test.ts test/horton-model-selection.test.ts test/spawn-worker-tool.test.ts test/worker-least-privilege.test.ts
• pnpm -C packages/agents build
• Verified a GPT-5 Horton can reply locally with provider openai/model gpt-5

Made with Cursor

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[codecov]

Codecov Report

❌ Patch coverage is 87.78626% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.31%. Comparing base (36a2c03) to head (b8aea1f).
⚠️ Report is 12 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
packages/agents/src/model-catalog.ts	88.50%	10 Missing ⚠️
packages/agents/src/agents/worker.ts	70.00%	3 Missing ⚠️
packages/agents/src/bootstrap.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4261      +/-   ##
==========================================
- Coverage   64.60%   61.31%   -3.29%     
==========================================
  Files         144      120      -24     
  Lines       19295    16897    -2398     
  Branches     4745     4169     -576     
==========================================
- Hits        12465    10360    -2105     
+ Misses       6827     6536     -291     
+ Partials        3        1       -2     

Flag	Coverage Δ
packages/agents	58.89% <86.20%> (+4.49%)	⬆️
packages/agents-runtime	78.61% <100.00%> (ø)
packages/agents-server	66.03% <ø> (ø)
packages/agents-server-ui	0.00% <ø> (ø)
packages/electric-ax	38.59% <ø> (+0.62%)	⬆️
packages/experimental	?
packages/react-hooks	?
packages/start	?
packages/typescript-client	?
packages/y-electric	?
typescript	61.31% <87.78%> (-3.29%)	⬇️
unit-tests	61.31% <87.78%> (-3.29%)	⬇️

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