Carson 4.5.0

New

• Harness-aware worktree directories. carson checkin / carson worktree create place the worktree under the calling harness's agent directory — .pi/worktrees/ from a Pi session (detected via PI_CODING_AGENT), .claude/worktrees/ otherwise, exactly as before. Set CARSON_AGENT_DIR to override. Bare-name resolution, .git/info/exclude bookkeeping, and diagnostics follow the chosen directory, and commands that take a worktree name resolve across all agent directories, so worktrees created by another harness remain reachable.
• Sweep and reap cover .pi/worktrees/. Both agent-directory lists gained .pi.

Why

The worktree directory was hardcoded to .claude/worktrees/, so Pi sessions produced Claude-flavoured paths. Each harness's worktrees now live under their own directory.

Migration

None. Existing .claude/worktrees/ worktrees resolve by name as before.