muxr v0.8.1: worktrees, live model switch, compact, fork Session isolation: - Git worktrees by default for harness sessions - Each context gets its own branch (muxr/<context>) - Kill cleans up worktree and branch New claude harness commands: - muxr claude model <name>: live /model switch, no restart - muxr claude compact [--threshold 80]: bulk context compaction - muxr claude fork: worktree + fork-session from current conversation Per-vertical settings: effort, permission_mode, max_budget_usd Restore --continue fallback when session ID is lost