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Aiden Cline f7dcfc2680 feat: drive reasoning variants from models.dev reasoning_options

Parse the curated reasoning_options field from models.dev api.json and use
its effort values to generate reasoning variants instead of the hardcoded
per-package tables, in both the v1 provider catalog and the v2 catalog plugin.

- core: ModelsDev.ReasoningOption discriminated union (toggle | effort |
  budget_tokens); effort values stay open strings and unknown option types
  are tolerated since api.json is cast, not decoded
- core: ReasoningVariants shared per-package effort encoder used by v1
  ProviderTransform.variants and the v2 ModelsDevPlugin
- core: v2 catalog generates effort variants from reasoning_options;
  curated experimental modes win id collisions; anthropic profile gains
  the effort semantic
- llm: anthropic protocol supports adaptive thinking, lowers effort to
  output_config.effort, and sends the effort-2025-11-24 beta header
- opencode: resolved Provider.Model carries capabilities.reasoningOptions
  (unknown types and null effort values dropped at the mapping boundary);
  config models accept reasoning_options; models without usable effort
  data fall back to the hardcoded tables unchanged

Catalog-wide audit vs live api.json: 2975 models byte-identical, 38 diffs,
all data correcting stale hardcoded effort lists.

2026-06-09 17:21:11 -05:00