Issue #3572402: Add effort, adaptive thinking, and native token usage support

Carlos Ospinarequested to merge
issue/ai_provider_anthropic-3572402:3572402-add-effort-adaptive into 1.3.x

Adds Anthropic-specific model settings and native API features:

  • Effort parameter (low/medium/high/max) via getModelSettings()
  • Extended thinking mode (adaptive/enabled with budget) via getModelSettings()
  • Model detection helpers (supportsEffort, supportsThinking, supportsAdaptiveThinking)
  • requiresNativeApi() returns TRUE when effort or thinking configured
  • buildNativePayload() handles effort in output_config, thinking blocks, temperature override
  • parseNativeResponse() extracts thinking blocks to metadata, maps reasoning tokens
  • 30 new tests covering model detection, settings, payload, and response parsing

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

Closes #3572402

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