docs(18): capture phase context

.planning/phases/18-global-items-public-profiles/18-DISCUSSION-LOG.md

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+# Phase 18: Global Items & Public Profiles - Discussion Log
+
+> **Audit trail only.**
+
+**Date:** 2026-04-05
+**Phase:** 18-global-items-public-profiles
+**Areas discussed:** Global Item Schema, Seed Data, User Profiles, Setup Visibility, Public Profile Page, Global Item Page
+**Mode:** --auto --batch
+
+---
+
+## Global Item Schema
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Separate globalItems table | brand, model, category, weight, price, image, description | ✓ |
+| Flag on user items table | isGlobal boolean on existing items | |
+
+**User's choice:** Separate table (auto-selected, per PROJECT.md decision)
+
+## User Profiles
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Extend users table | Add displayName, avatarUrl, bio columns | ✓ |
+| Separate profiles table | New table with FK to users | |
+
+**User's choice:** Extend users table (auto-selected)
+
+## Setup Visibility
+| Option | Description | Selected |
+|--------|-------------|----------|
+| isPublic boolean, default false | Simple toggle, private by default | ✓ |
+| Visibility enum (private/public/unlisted) | More granular | |
+
+**User's choice:** isPublic boolean (auto-selected)
+
+## Deferred Ideas
+- Freeform reviews, comments, follow users, fork setups