Add Claude Sonnet 5.5 to the model registry

[adambalogh]

Summary

Registers claude-sonnet-5-5 (Anthropic, released 2026-09-28) with alias claude-sonnet-5.5.

• Pricing: $2 / $10 per MTok (0.000002 / 0.00001 per token), per https://platform.claude.com/docs/en/models/sonnet-5-5/overview — cheaper than Sonnet 5 ($3/$15).
• Parameters: the same page states setting temperature, top_p or top_k to a non-default value returns HTTP 400, so supports_temperature=False.
• Supersedes claude-sonnet-5, which stays registered so persisted chats keep resolving; the paired chat-api PR hides it from the picker.
• Tests: resolve + cost tests added to tests/test_pricing.py (154 pass); make lint clean. Docs tables (README, CLAUDE.md) updated. uv.lock untouched.

Companion catalog PR: OpenGradient/chat-api#344. Land this one first.

🤖 Generated with Claude Code

https://claude.ai/code/session_01WZ4ELrAXe55aczokBw8HrW

[Copilot]

Copilot review overview

🟢 Approval recommended

The registration is complete, consistent with existing patterns, and adequately tested and documented.

Review effort: Balanced
Findings: None

What changed in this PR

Registers Claude Sonnet 5.5 as an Anthropic model with pricing, parameter restrictions, aliases, tests, and documentation.

Changes:

• Added canonical and dotted model aliases with $2/$10 MTok pricing.
• Disabled temperature forwarding for compatibility.
• Added resolution/cost tests and updated supported-model documentation.

File	Description
tee_gateway/​model_registry.py	Adds the model configuration and aliases.
tests/​test_pricing.py	Tests resolution, pricing, flags, and cost.
README.md	Lists the new supported model.
CLAUDE.md	Updates provider documentation.

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