Verdict: ~3-5 days. pcbnew undo already UUID-guards stale pointers; core
work = porting that guard to eeschema, splitting connectivity out of the
SCH SKIP_UNDO gate, plugging the SKIP_UNDO removed-item leak, silencing
the incomplete-undo modal. Cross-linked from 09 and the overview index.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019ejJEvS7ogef2o9gVTXjmp
