Agent Skills: start

Start working on a Linear issue — check blockers, assign, move to In Progress, create branch, plan implementation, execute with checkpoint updates, review and triage findings. Autonomous mode via the `auto` token (skips plan approval; converts prompts to documented defaults; used by /auto). The `interactive` token (implies worktree mode) sets up the worktree and claims the issue, then hands off to the user without planning/implementing, so you can work in an isolated worktree without interfering with background `wt` agents. Use when the user says 'start issue', 'work on PL-XX', 'begin PL-XX', or invokes /start.