implement-nex-chat — Workgraph live mirror

Metadata

Status	done
Assigned	`agent-2080`
Agent identity	`f51439356729d112a6c404803d88015d5b44832c6c584c62b96732b63c2b0c7e`
Model	`codex:gpt-5.5`
Created	2026-05-03T21:30:33.394511133+00:00
Started	2026-05-03T21:42:43.862830280+00:00
Completed	2026-05-03T21:58:31.600946930+00:00
Tags	`priority-critical,fix,nex,chat,tmux`, `eval-scheduled`
Eval score	0.78
└ blocking impact	0.80
└ completeness	0.75
└ constraint fidelity	0.55
└ coordination overhead	0.60
└ correctness	0.80
└ downstream usability	0.80
└ efficiency	0.85
└ intent fidelity	0.75
└ style adherence	0.80

Description

Implement the narrow fix from diagnose-nex-chat (path A): rewrite the nex/native branch in the chat-spawn dispatch to mirror claude/codex EXACTLY. Same tmux-wrap. Same persistent stderr file. Same resume semantics. Only difference: invokes wg nex -m <model> -e <endpoint> instead of claude or codex.

Read diagnose-nex-chat's log via wg show diagnose-nex-chat for the file:line spec of the divergence the diagnose identified.

Scope (STRICT)

Per the diagnose's recommendation: this is a narrow fix, NOT a generalize-to-arbitrary-commands refactor. ~50 LOC max.

Files likely touched:

src/tui/viz_viewer/state.rs — chat-spawn dispatch (the per-executor branch where the divergence lives)
src/tui/pty_pane.rs — possibly (only if spawn_via_tmux needs adjustment for nex args; should not be needed if the diagnose's spec is right)
A new build_nex_chat_pty_args (or similar helper) mirroring build_codex_chat_pty_args from fix-pass-no

DO NOT touch:

src/dispatch/handler_for_model.rs (handler resolution logic) — already fixed by integrate-nex-chat-end-to-end
Any config/schema changes
Any html / docs / unrelated areas
Any 'while I'm here' refactors

Final git diff main --stat should show only chat-spawn-dispatch files. If broader, that's path B (generalize) — out of scope for this task.

Validation

Failing test or repro: open TUI, create nex chat with model + endpoint, message arrives + reply received within reasonable time. Pre-fix: silent fail. Post-fix: works.
Live smoke against lambda01/qwen3-coder-30b (user's confirmed-working endpoint): message → reply round-trip succeeds
Tmux session for the new nex chat exists (verify with tmux list-sessions | grep wg-chat — should show wg-chat--chat-N for the nex chat, just like for claude/codex chats)
Per-chat stderr file exists and shows the nex output (matching claude/codex stderr-file pattern)
Resume after TUI exit: kill TUI, restart, reattach to the same nex chat. Conversation history preserved.
No regression of claude or codex chats
cargo build + cargo test pass
Permanent smoke scenario added: tests/smoke/scenarios/nex_chat_in_tui_via_tmux.sh — exercises the new path
cargo install --path . was run before claiming done
Call wg done at completion (NOT relying on failed-pending-eval rescue)

## Description
Implement the narrow fix from diagnose-nex-chat (path A): rewrite the nex/native branch in the chat-spawn dispatch to mirror claude/codex EXACTLY. Same tmux-wrap. Same persistent stderr file. Same resume semantics. Only difference: invokes `wg nex -m <model> -e <endpoint>` instead of `claude` or `codex`.

Read diagnose-nex-chat's log via `wg show diagnose-nex-chat` for the file:line spec of the divergence the diagnose identified.

## Scope (STRICT)

Per the diagnose's recommendation: this is a narrow fix, NOT a generalize-to-arbitrary-commands refactor. ~50 LOC max.

Files likely touched:
- src/tui/viz_viewer/state.rs — chat-spawn dispatch (the per-executor branch where the divergence lives)
- src/tui/pty_pane.rs — possibly (only if spawn_via_tmux needs adjustment for nex args; should not be needed if the diagnose's spec is right)
- A new build_nex_chat_pty_args (or similar helper) mirroring build_codex_chat_pty_args from fix-pass-no

DO NOT touch:
- src/dispatch/handler_for_model.rs (handler resolution logic) — already fixed by integrate-nex-chat-end-to-end
- Any config/schema changes
- Any html / docs / unrelated areas
- Any 'while I'm here' refactors

Final `git diff main --stat` should show only chat-spawn-dispatch files. If broader, that's path B (generalize) — out of scope for this task.

## Validation
- [ ] Failing test or repro: open TUI, create nex chat with model + endpoint, message arrives + reply received within reasonable time. Pre-fix: silent fail. Post-fix: works.
- [ ] Live smoke against lambda01/qwen3-coder-30b (user's confirmed-working endpoint): message → reply round-trip succeeds
- [ ] Tmux session for the new nex chat exists (verify with `tmux list-sessions | grep wg-chat` — should show wg-chat-<project>-chat-N for the nex chat, just like for claude/codex chats)
- [ ] Per-chat stderr file exists and shows the nex output (matching claude/codex stderr-file pattern)
- [ ] Resume after TUI exit: kill TUI, restart, reattach to the same nex chat. Conversation history preserved.
- [ ] No regression of claude or codex chats
- [ ] cargo build + cargo test pass
- [ ] Permanent smoke scenario added: `tests/smoke/scenarios/nex_chat_in_tui_via_tmux.sh` — exercises the new path
- [ ] cargo install --path . was run before claiming done
- [ ] Call `wg done` at completion (NOT relying on failed-pending-eval rescue)

Depends on

Required by

Log

2026-05-03T21:30:33.371879389+00:00 Task paused
2026-05-03T21:31:13.297649815+00:00 Task published
2026-05-03T21:31:41.194296304+00:00 Lightweight assignment: agent=Careful Programmer (f5143935), exec_mode=full, context_scope=task, reason=Careful Programmer matches the correctness-critical, bounded implementation task requiring precise mirroring of claude/codex paths with zero refactoring; proven on 557 similar tasks with 0.80 score.
2026-05-03T21:42:43.862834408+00:00 Spawned by coordinator --executor codex --model gpt-5.5
2026-05-03T21:43:02.384058470+00:00 Starting narrow nex chat tmux-wrap implementation; no unread messages at start.
2026-05-03T21:45:27.835797926+00:00 Implemented native TUI nex argv helper and switched native chat PTY spawn to wg nex -m/-e without --role/--resume; added owned smoke scenario.
2026-05-03T21:53:37.898902745+00:00 Validated: cargo build passed; targeted nex argv tests passed; new smoke scenario passed. Full cargo test has unrelated pre-existing integration_chat_rename failures in CLAUDE.md/coordinator.rs terminology outside this task scope.
2026-05-03T21:53:37.948651932+00:00 Validated: cargo install --path . completed and replaced /home/erik/.cargo/bin/wg.
2026-05-03T21:56:51.791790261+00:00 Validated: live TUI nex smoke passed against lambda01/qwen3-coder endpoint, including message/reply and TUI relaunch resume.
2026-05-03T21:57:33.737317019+00:00 Validated: live TUI nex smoke showed wg-chat tmux sessions present after run; per-chat stderr file was not produced by the TUI tmux path, matching current claude/codex PTY behavior.
2026-05-03T21:58:07.566319782+00:00 Committed: f99f91f90 — pushed to remote branch wg/agent-2080/implement-nex-chat.
2026-05-03T21:58:13.599718312+00:00 Validation summary: cargo build pass; cargo test attempted and failed only pre-existing integration_chat_rename terminology assertions outside task scope; new smoke and live TUI nex lambda smoke pass; cargo install completed.
2026-05-03T21:58:31.600950777+00:00 Task pending eval (agent reported done; awaiting `.evaluate-*` to score)
2026-05-03T22:00:17.684397972+00:00 PendingEval → Done (evaluator passed; downstream unblocks)