Auto-namer now probes refs/heads/<name> and appends -2, -3, … (up to 50)
when the desired slug is taken, instead of failing with "branch already
exists" and leaving the worktree on its placeholder name.
Structured-generation waterfall replaces opencode/gpt-5-nano with
opencode/minimax-m2.5-free and opencode/nemotron-3-super-free so users
without nano configured fall through to free models they actually have.
Mohamed Boudra
d88af28e93