- Replace legacy turn-window logic with stable per insert
- Require non-empty stream IDs; seed order keys per (kind,id)
- Pair out-of-order ExecEnd/Begin and drop canceled execs
- Surface init/submit errors as BackgroundEvent diagnostics
- Improve status panes, borders, and preview truncation by display width
- Update release workflow; docs: AGENTS.md, prompt_coder.md; add MERGE.md and postmortem
Build: ./build-fast.sh passes locally with no warnings.