Add a fourth model profile preset that assigns models by agent role:
opus for planning and debugging (reasoning-critical), sonnet for
execution and research (follows instructions), haiku for mapping and
checking (high volume, structured output).
This gives solo developers on paid API tiers a cost-effective middle
ground — quality where it matters most (planning) without overspending
on mechanical tasks (mapping, checking).
Per-agent overrides via model_overrides continue to take precedence
over any profile preset, including adaptive.
Closes#1713
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Claude Code's "opus" alias maps to a specific model version (claude-opus-4-1).
Organizations that block older opus versions while allowing newer ones see
agents silently fall back to Sonnet. By returning "inherit" instead, agents
use whatever opus version the user has configured in their session.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
