test: v3 full team-cycle proof (no claude-max-proxy)

[aram-devdocs]

Full v3 multi-agent flow test, OpenAI-only brains.

Required visible conversation across channels:

1. #plumb-lead — Aram pastes #N. Lead acknowledges in 2-3 lines.
2. #plumb-design — lead crossposts via message tool with @plumb-architect. Architect drafts contract (or 'no design needed') in #plumb-design. Architect ends with @plumb-lead.
3. #plumb-design — lead crossposts @plumb-planner. Planner posts breakdown.
4. #plumb-ops — lead crossposts to @plumb-eng-a or @plumb-eng-b. Engineer dispatches Codex/Claude Code via ACP and opens a PR. Engineer posts PR URL in #plumb-ops.
5. #plumb-review — lead crossposts @plumb-reviewer. Reviewer pulls PR, posts verdict.
6. #plumb-lead — lead summarizes + auto-merges if all gates green.

Code change: under ## [Unreleased] in CHANGELOG.md, add - v3 visible team-cycle proof (OpenAI brains). One line. Trivial.

Lead: literal channel IDs in your AGENTS.md routing table. DO NOT sessions_spawn — use message only.

[aram-devdocs]

Closing — historical multi-agent setup test artifact, no longer relevant.

[aram-devdocs]

Closing — historical multi-agent setup test artifact, no longer relevant.