T2: background agent / lead writes are confined to the session root, so an
out-of-root sibling worktree (.worktrees/<branch>) is unwritable — the
agent could design but not write, and there's no permission to grant. Fix
options for clide noted. Plus a positive: clide image show works first-try.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>