# Session 0004.0 — Transcript

> App: engineering
> Start: 2026-06-05T12-37 (PST)
> Type: coding
> Status: **PLACEHOLDER — claimed at session start; finalized at session end.**
>
> This file reserves session ID 0004 for engineering. The driver replaces this
> body with the full transcript and renames the file to its final
> SESSION-0004.0-TRANSCRIPT-2026-06-05T12-37--<end>.md form at session end.

## Launch prompt

```
Tangent: define best practices for a "Solution Design" (a combined business analyst + product + engineering spec) in the Engineering docs, and reference it in the engineering handbook.

A Solution Design should contain:
- Business Context
- Problem Statement
- Targeted Business Outcome(s) with success metrics
- Business Use Cases — BDD format, business-centric (no product/technical detail), each with acceptance criteria (what does a user successfully completing that business scenario look like?)
- Product Use Cases — BDD format, describe the UX (buttons, notifications, etc.), each linked to a Business Use Case where applicable
- Wireframes — show the user experience; doesn't need to be polished, but UX components should be in approximately the right location
- Technical Design — high-level architecture diagrams, and for each Product Use Case a sequence diagram + technical implementation details
- Delivery Plan — overall approach/strategy, then a Slicing Plan (Slices -> completed Product Use Cases), plus anything else useful for execution

Question to answer: "Am I missing anything?"

```

## Deferred decisions

_Autonomous-mode low-confidence calls the driver made and would have
liked operator input on. Appended as the session runs; surfaced at
finalize. Empty if none._