Add GPT 5.6 agent model support

[shrisukhani]

Summary

Adds Python SDK model literals for the GPT-5.6 models introduced in browserctrl#1211, while limiting HyperAgent support to Luna.

Changes

• Add gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna to CuaLlm
• Add gpt-5.6-luna to HyperAgentLlm
• Bump the package version to 0.93.2

Validation

• poetry run ruff check hyperbrowser/models/consts.py
• poetry run ruff format --check hyperbrowser/models/consts.py

Link to Devin session: https://app.devin.ai/sessions/f284337c4bc9449da73ead049ff14a40
Requested by: @shrisukhani

---

Note

Low Risk
Additive Literal entries and a patch version bump only; no runtime logic changes.

Overview
Adds Python SDK typing support for new GPT-5.6 models aligned with backend support.

HyperAgentLlm now includes gpt-5.6-luna as the only 5.6 variant for HyperAgent tasks. CuaLlm adds gpt-5.6-sol, gpt-5.6-terra, and gpt-5.6-luna, and the literal is reformatted to a multi-line list. Package version is bumped to 0.93.2.

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