Rewrites StartAsync to provision a git worktree before transitioning the task to Planning state, writes .mcp.json and .claude/settings.local.json into the worktree, and fixes ResumeAsync to supply the updated PlanningSessionResumeContext fields (Token, WorktreePath). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>