Mapa fixo commitado em scripts/lib/worktree.mjs (cheap=cheapestinference/deepseek-v4-flash, pro=opencode-go/qwen3.7-max, zen=opencode-go/ox-alpha-free, go=opencode-go/mimo-v2.5, alibaba=alibaba-token-plan/qwen3.7-max) com WORKTREE_VARIANT=max sempre; resolveWorktreeModel fail-high em múltiplas flags; opencodeLaunchDirective passa a emitir --model <map|preset> --variant max --auto; scripts/worktree.mjs valida at-most-one antes do claim e repassa modelo nos 3 propósitos (next/plan/new) com help/docblock atualizados; .agents/shell/worktree.sh, .opencode/commands/worktree.md, .agents/skills/worktree-next-issue/SKILL.md e local-database skill com contrato remapeado (--go deixa de ser no-op); tests/unit/worktree.unit.spec.ts pina as 5 flags, variant e guardrail.
Closes#859
