add claude sonnet 4.6 on openrouter

[SomeoneWithOptions]

Summary

Add anthropic/claude-sonnet-4.6 to the OpenRouter provider with metadata and pricing sourced from OpenRouter’s published model data.

Changes

• Added new model file: providers/openrouter/models/anthropic/claude-sonnet-4.6.toml
• Included OpenRouter-backed model metadata:
  • name, family, release_date, last_updated
  • capability flags (attachment, reasoning, temperature, tool_call, structured_output)
  • open_weights = false
• Added standard pricing:
  • input: 3.00
  • output: 15.00
  • cache read: 0.30
  • cache write: 3.75
• Added long-context pricing ([cost.context_over_200k]) from OpenRouter line items:
  • input: 6.00
  • output: 22.50
  • cache read: 0.60
  • cache write: 7.50
• Set limits/modalities from OpenRouter:
  • context = 1_000_000
  • output = 128_000
  • input modalities: text, image
  • output modalities: text

Notes

• knowledge was intentionally not set because OpenRouter does not expose a knowledge-cutoff field for this model in the public model payload/page data.

Validation

• Ran bun validate successfully.