Gate Claude effort/adaptive-thinking by resolved model capability

[Copilot]

daily-doc-updater and daily-function-namer were failing on turn 1 when the model_size experiment selected models that reject Claude effort / adaptive-thinking fields. This change makes Claude request shaping model-aware so unsupported params are not sent to incompatible models.

• Claude engine: capability-aware request shaping

  • Added model-capability gating so effort and adaptive-thinking config are only emitted when the resolved Claude model supports them.
  • Prevents first-request 400 invalid_request_error from unsupported params while preserving current behavior for capable models.

• Model resolution integration

  • Applied gating after resolved model selection (including model_size experiment outputs), so behavior matches the actual runtime model instead of static config assumptions.

• Compatibility and scope

  • Keeps existing model-selection and fallback flow unchanged.
  • Targets only unsupported-parameter emission; no workflow semantic changes beyond avoiding immediate API rejection.

// simplified request-shaping logic
if (!supportsAdaptiveThinking(resolvedModel)) {
  delete request.effort;
  delete request.thinking?.type; // adaptive
}