Add changesets covering recent fix/feat commits since v0.8.4 that did not yet have one: TUI wide layout, TUI log copy feedback, dashboard merge-base diff, dashboard task-only file diffs, engine concurrency races, memory dream session-state read, AI-summarized merge commits, and the FN-2877 task card fallbacks. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>